Yup, I won't argue with you there, and I agree that there's far too much of that about.
It's interesting who's considered a "vendor". I realised only in a very recent discussion in this forum that some people consider all textbook authors to be "vendors", by definition. (And technically, they may be right: if you write a textbook and Wiley publishes it and pays you a 10% commission on its sales, you are profiting from it - I think of those people as being in a basically different category altogether from the people selling horrible courses for $3,999 which teach a glorified moving average crossover, and have fake testimonials on their revolting websites. The ones as clearcut as that are actually a minority, though, in my opinion).