Yup. It takes a lot of work to find someone that can insure your company can continue growing and thriving. It takes a lot of work to find someone who shares the same ideals that you do in running the beastie. 

While I've never had the job description of doing so, I have had to supply the technical grilling for executives before (Head of IT, CTO/CIO positions, etc). It requires a lot more than just knowing the technical bits of the company (which is why someone as junior as myself on such food chains did the grilling). Politics, ideology, the ability to juggle budgets and profits, setting and making strategic goals... all of these figure far larger than just being able to make Vickie bend better.

I've known Dan and Chris personally for ages. They truly love what they do. As late as 2006, Chris still preferred his ancient (even by 2006 standards) SGI Irix workstation to make mesh with. These guys love mesh, love art, and really enjoyed their job. OTOH, once a company reaches a certain size or age, it's time to bring in someone who can push it to even greater heights, and in new directions. It also means stepping back and letting the company grow on its own, only keeping enough control to step in and take over if anything goes wrong. 

Me, if I started a company and became a zillionaire from it, I'd step back and see what someone else can do with it too. That way I could still enjoy the thing I founded it on without risking burnout or having the thing I loved turn into the thing I'd end up disgusted with.