J. Carmack was able to collect funds and invent FPS.
I'm a Carmack fanboy, but unfortunately he didn't "invent FPS" when he made Wolfenstein 3D. That honor goes to someone in the 70s with a game called Maze War.
When it comes to indie games, the first game I bought and played that I knew was indie, was AudioSurf. However, now my eyes have been opened and I'm playing more and more indie titles.