All of my games are available to everyone for free.
However, if you enjoyed any of my games, a couple of bucks to cover website hosting costs and support my ongoing efforts would be gratefully appreciated. I think $2 per game enjoyed is a fair price. Thanks.
Dropbox (250MB Extra space)
Penzu (20% off yearly subscription)
Hole in the Wall Hosting ($10US per year for 300mb space, 30gb bandwidth)

John Romero?
Well I base that on the time it took me to complete it.. But it was a long game. When I played Doom 3, I hadn't played a FPS for YEARS before I tried to complete it.. The previous FPS I played were Quake 3 and Doom. I actually played doom quite a lot.. Loaded on my laptop amongst other things.
Yeah. I think it's well accepted that IDSoftware make Engines not games though.. Although I don't think it would be a good idea to LEAVE the direct to customer game market as they would need to continually understand what games need in the background. On that note read some of their news:
http://www.idsoftware.com/
Seems they have done a lot of iPhone porting. :S