$50 if it's a AAA title. That's probably not happening though. $15-20 for a top-notch downloadable title. Something like Darwinia (maybe), World of Goo, Zeno Clash, etc. Ideally at the low end of that price range, though I'd go up to $20 if it were really good. For most of the stuff that gets released, $1-5. For me, it breaks down similarly to the XBox online market, though I feel like most Arcade titles are 400 points more than I'm willing to pay and usually buy on sale. Most of the good homebrew stuff is comparable to the good stuff in Indie Games, and I'd be willing to pay accordingly, though there are again a lot of games there that I think are fun but won't spend enough time with to justify buying period. Basically, I'm willing to pay commensurate with quality, and there is already an existing scale which I can use to compare against. I am very happy that there's a sizable freeware scene out there but I am willing to pay based on the effort that went into the game and the amount of time I'm expecting to spend with it.