I can get behind celebrating ambition, but only if it doesn't as a side effect involve widening wage inequality in the society.
Every ethical dollar earned is a byproduct of value creation. Maybe you meant something more like "as long as he's not ripping off his customers," but otherwise that's an odd thing to say in response to someone who makes good money but is still looking for side jobs.
Personally, the way I see it, the more money goes to wages, the better, and if that's because some guy is earning millions a year, I still think it's good.
Income from people starting new companies, that's fine too. What's bad is rent extraction, ossification, monopolies and private institutions that have power over people.