I'm an advocate of paid games. First of all, because making a good game is a lot of work, and in my opinion work should be paid. I mean, you don't expect your plumber or dentist to work for free, do you? So why should a developer? Then with a paid game, you help itch.io because you give them a share for hosting all these (mostly) free games. And only with paid games, you can make sales. I have paid and free games in my repertory, but every paid game also has a free demo (you can play at least the first hour or the first level of the real game, so you can test it, and see if you like it and how it works). "Pay what you want" seems a good option, but I never earned a dime with it. Last but not least, a free game is no guarantee that more people will play it.