If you weren’t spending your money on useless treatment, you could enrich your life in other ways, retire earlier, or be richer.
There is an incentive to lie when your methodology is bad.
In all fields, the best methodologies are boring.
Even if all four of these sentimental or pragmatic justifications are true, doing the wrong thing is still worse than doing nothing.
“It is, of course, hard to get people in any profession to do the right thing when they’re paid to do the wrong thing.”