I took a 1/3 pay cut to work at a startup because I believe in what the company is trying to do. That's the only reason I keep doing what I do, because the long term goal for the company is in line with my beliefs. Even though I commute for 2+ hours each way, work long hours, and am on call 24/7 for the last 3 years. At some point it may become too much, or another offer might be more interesting, but at the moment, I believe very much in what the company is trying to do.