Here's a very lengthy, but well thought through article by Michael O. Church advising people who think that working at a startup is their key to wealth or startup success.
I won't attempt to summarise it, and in fact I won't recommend reading the whole thing unless you are one of those naive people who think that working for a startup is going to be your path to riches (if you think that, then do read the article from beginning to end).
If you're reading this blog, though, you probably know that the only way to get there is to start your own startup, and that any job that you may take on the way is just a stepping stone, and that you don't expect to get any more out of it than what's actually paid out, and so on.