Given the fact that they're greenlighting 10 games a month (or something, not sure here, maybe it's not even a regular deadline but anyway it's some kind of limit) it could hurt other games, maybe more worthy.Even if 100% of the Greenlight votes for this game are people who just want to play it for free, and Valve decides the game quality is good enough...you end up with a game on Steam that maybe some people will play, and maybe some people will buy who didn't see it on Greenlight. What is bad about this situation? It doesn't hurt Valve any more than hosting Black Mesa or other free games, does it? In fact it should hurt them LESS if it's a niche game without many downloads, or a smaller game (less bandwidth than Black Mesa).
I don't know, I see your point but I too am not too confortable with this "free game for votes" policy, it feels like cheating/bribing. I want more good games on Steam, I don't really care for more games period.