How the course business actually works

Selling knowledge has excellent economics and a structural honesty problem: the most profitable thing to teach is often how to sell courses. Here is the mechanism, and why so much of the income data on this site is unreliable.

Part of the common ways of making money.

This one needs a disclosure before anything else: this site does not sell courses, and I have no product. That matters because what follows is critical of an industry, and you should be able to weigh whether I have an interest in being critical of it. I do not, beyond wanting the rest of the site to be trusted.

It also matters because this method is why so much of the income data in the other posts is unreliable.

The economics

Excellent, and there is no point pretending otherwise.

Made once, sold repeatedly. Like software, the marginal cost of one more sale is near zero — but unlike software, there is no ongoing obligation. No servers to keep up, no support burden, no feature requests. You record it once.

No inventory, no delivery cost, no returns handling beyond a refund policy.

Margins near 100% after acquisition costs.

Price is set by perceived value, not by cost. A course that took two weeks to make can sell for £2,000 if the buyer believes it leads to £20,000.

Which explains the volume of them. The economics genuinely are that good.

Where the money comes from

The student, out of savings or credit, in the expectation of future earnings.

That last clause is the whole thing. Most course purchases are an investment decision by the buyer: they pay now expecting more later. Which means the seller is paid before the claim is tested, and usually regardless of whether it turns out true.

Compare with an agency, paid for a delivered outcome, or software, where the customer leaves if it stops helping. Those have feedback loops attaching payment to whether it worked. A course sold once, upfront, with a 30-day refund window, largely does not — the buyer typically cannot tell whether it worked inside the refund period, because the method takes months to test.

That is a structural weakness in the arrangement, not an accusation about any individual. Good courses exist and some are excellent value. The mechanism simply does not reward them differently from bad ones.

The recursion problem

Here is the part that connects to everything else on this site.

The most reliably profitable subject to teach is how to make money, because that is what people most want to buy. And of the money-making methods available, the one with the best economics is selling courses.

So the industry converges on a stable pattern: people who make money teaching people how to make money, whose demonstrable success is at teaching rather than at the thing being taught.

This is not a conspiracy and mostly not fraud. It is what the incentives produce. Consider it from the seller’s side. If you found a genuinely repeatable method producing good returns, teaching it to thousands of competitors would reduce those returns. Keeping it quiet would be more profitable. So the methods most loudly taught are systematically biased toward those that do not degrade when shared — which correlates uncomfortably well with those that were not producing much to begin with.

There are honest exceptions: skills that do not saturate, where teaching genuinely does not compete with doing. But the base rate runs the other way, and it is worth applying.

Why this contaminates everything else

This is why nearly every other post here says the evidence is weak.

For dropshipping, blogging, creator income and day trading, the most visible income figures come from people selling instruction in the method. Their incomes are real. They are frequently just not from the method they are demonstrating.

The screenshot of £40,000 in a month may be entirely genuine — and be course revenue rather than store revenue. Both are “made online”. Only one supports the claim being made.

The single most useful question when reading any income claim: what fraction of this income comes from teaching the method? It is answerable surprisingly often, and it reorganises what you are looking at.

What the evidence says

Poor, self-reported, and produced by parties with an obvious interest — which is the finding.

Platform-wide data on completion rates for online courses is consistently discouraging, well below what buyers assume when purchasing. That is not necessarily the seller’s fault; people buy with good intentions and life intervenes. But it means the median outcome for a course buyer is often “did not finish”, which no sales page models.

What the legitimate version looks like

Because it does exist, and the pattern is distinguishable.

The teacher demonstrably does the thing, with evidence predating the teaching.

The claim is specific and modest. “This is how I do X” rather than “this will change your life.”

Free material is substantial, so you can evaluate the thinking before paying.

Price relates to a real outcome, not to manufactured scarcity, fake countdowns or a permanent closing-soon.

The subject does not saturate — a skill, not an arbitrage that stops working once shared.

If you are considering selling one

The economics are real and the reputational arithmetic runs longer than the sales page.

Do the thing first, verifiably. The strongest position is having succeeded at something else and teaching that.

Sell to people who can act on it, and be honest about who cannot.

Expect the trust to be the asset. Which is the same as everywhere else on this site — the product is the activity, and the durable thing is the relationship. Sell one bad course to your audience and the audience is what you spent.

And if you are considering buying one

Ask where the teacher’s income comes from. If it is mostly courses, you are buying instruction in course-selling regardless of the stated subject.

Look for the free material first. Anyone with something real usually has a great deal of it in public.

Check whether the method saturates. If it works because few people do it, teaching it widely is self-defeating, and the person selling knows that.

And weigh it against free. For most subjects, the information is available at no cost from people with no incentive to oversell. What you are paying for is curation, structure and accountability — which are worth something, just far less than most prices imply.