Well depends. Really I could live off just 10-15k a year, and even less than that if I didn't have student loans to pay. Same goes for Jonny (our programmer), so this could be enough to support us going full-time, especially considering it's only the first 2 months of revenue (these games have a much longer tail if they stay on the top downloads list, compared to retail games). But still, we're not gonna start our studio and go full-time till our next game is released (it will be $3-5), and/or Jonny's done with school.
And hey, I MAED A GAM3 W1TH Z0MB1ES!!!1 sold over 200k units in about 7 months, so that could definitely support at least 2 full-time developers.
But yeah, for bigger teams it's probably not feasible (the platform), but for teams of 1-3 it can definitely work, no matter what they charge, especially if they release on PC too (very little porting work with XNA).
-Jeremy Eden
JForceGames.com
