There is a set number of bitcoins, but there is also a system that limits how many bitcoins/hour are given out (difficulty). The more miners there are online, the harder it gets to generate bitcoins.
https://en.bitcoin.it/wiki/DifficultyAnd why is this? Because hardware keeps getting more powerful?
If so, that would still work well, since you could buy a new graphics card when it's released, then sell it for 75% of its original price when its successor comes out, and have little down time.
Anyone think it's still worth it?
I want to see someone who's actually doing what I plan on doing, with at least 8 GPUs.