GPL, BSD, Opensource/Free Software movement.

I've be a mindless supporter of these movements for years now not because I was a developer myself but because most of them provided me with a lot of useful free software.

However now that I'm becoming more of a programmer I'm questioning the ideology behind these movements.

1. For which situations are these intended? For every developer?
2. Doesn't it go against the developer himself? How can he secure profit while still sustain such projects?

Just willing to learn.
Thanks.

Non-developers won't bother compiling your application, so you can still sell binaries if you're a huge asshole, like the XChat developer.

Honestly, profits and etc. although practically necessary are all about selfishness. You need to get the right balance of profit and selflessness, and personally I think Open Source software is a good contribution to make to society.