The problem with passion jobs is that you may get a dose of disillusionment. I worked for 2 years at a startup which had an interesting product and great people. Busted my ass for below market pay but when the company got sold, the deal was structured in a way that rank and file employees got nothing while the founders and top managers walked with multi-millions. Since then I am very cynical about "passion". It often seems to be a tool for exploiting gullible people. Same in a lot of non-profits.

Low rank work for little money while the top guys make good money and fly around the world to meet in luxury hotels.