I'd probably be described as a "normal" entrepreneur. I worked on five startups, the last of which had a reasonably successful exit. I haven't started another company since. A company isn't the only "laboratory of ideas", and money let me explore some other options. I'm in a PhD program in mathematics now. I didn't avoid starting a company because it is hard work. I agree, starting a company had an addictive intensity that is hard to find elsewhere. Will I start another company some day? Maybe. Would I ever have a "normal" job again? No way.