I second Alex's post (in general, people named Alex tend to be pretty smart
)
I would not be honest if I said I don't get a feeling of "dammit, it should've been me!" every time I hear of somebody cashing in on a great idea, selling a business or going public, because those are close to my goals as well.
But, that feeling passes soon and I realize that I should be glad. Every time I hear of somebody succeeding, be it business or something else, I get reassured that "it can be done!" We're all surrounded by a bunch of negativity, people not understanding what personal development is about, and trying to get you to confirm to some "standard" of what you should do in life.
And when I hear about somebody climbing out of that pool of mediocrity and reaching his or her dreams, whatever they may be, my thoughts are "great! now there's another example for me to follow. I'm right in doing what I'm doing, I just need to not give up, just like that guy did."