I don't mind spending money on games I like, and even games I might like. Unless the game turns out to be a swindle, I don't mind paying for them. Even the one I hated, I didn't mind paying for: they'd put a lot of effort into it, they just missed the mark massively.
The game I play the most has a free version limited to the tutorial, so I got to try it before I bought it. I personally would be served better if I could try more games without paying for them if they were shit.
Does paying $8 improve the situation? I can try a lot of games. The games that I play a lot of would potentially earn more money from me in the long run. My favorite game I've put in over 200 hours over two years. I paid $20 for it. Would that developer make more money in that period from magna than the cut they got from Steam?
What about the games that were fun, lasted maybe 20 hours of play time, and would normally get like $5 cut? It would suck if they got less.