It’s not about ideas. It’s about opportunities:
Every founder who’s been in the game a few years has clouds of potential ideas floating around that they can’t find the time to work on. They might not all be good, but there are always too many of them. At the same time, though some people have this cloud of ideas following them even before they run their first business, many start off with few ideas. Before I started my first business (and for a year or two afterwards), I was one of those people… I didn’t have that many ideas. But now? I spot (and ignore) new business opportunities on a weekly basis.
Why is that? I think it’s because of a shift in perspective. Few businesses are actually started based on an “idea”. Instead, entrepreneurs start businesses because they spot opportunities. That is the shift in perspective that occurs after a few years running your own business: because your job is, basically, to identify and pursue opportunities, you become very good at noticing and evaluating opportunities for business.