Same here, I've bought close to 13 courses on Udemy. For learning React, Unity, and for brushing up my Nodejs, a few for game design and drawing etc. Also bought a Cocktail making course just for kicks.

I usually buy courses for 10$, which are good. But there are some awesome courses which costed a lot more, from 99$ to 199$. I used to add them to my wishlist so that I can buy them later when I save enough money, but sooner or later, all those wishlisted courses would be on sale for 10$. No idea if this is intentional, or if I picked the most popular courses and hence were on sale.