I am not picking on anybody, I don't code much for free either (should be apparent by looking at my profile). I am just wondering out loud how some guys afford to do that, while others (myself included) try to follow PG's advice of building something small and easy on top of mountains of free products created by others.

In fact, if I were Zuckenberg, I'd give a fat chunk of Facebook stock to various free software projects such as PHP, etc. Moreover, I believe it should become a tradition, those guys are the reason why "startups are so cheap!" (quote) these days.