That seems like a logical explanation. But as far as I could tell reading about Wozniak[1] at least, the guy was 110% focused on playing with technology and making cool things. He didn't seem to care so much about money. So presumably once he had lots of money, he could continue doing what he liked so much. So does it mean that money actually accomplish the opposite result for him? making him less interested in doing hands-on stuff? Or maybe he simply achieved all he ever wanted and there was nothing more to play with??
You know Woz was in an airplane accident in the 80s as I recall, so it may have changed his perspective. In fact he organized a rock concert (the Us Festival) to try and recapture Woodstock in the 80s and I think did some elementary school teaching for a while. But technology for him was fun, it was never really about the ambition. In fact he had to be lured away from HP by friends to co-found Apple, so he didn't have dreams of conquering the world.
its probably not that he stopped playing with technology but that he stopped beein involved with technology that is marketed and sold and known.
not everybody craves the recognition and thus they might not sell/opensource everything they do. i for my part would be very content with my private metalworking/electronics(woodworking shop and just do stuff that I want/need just to scrap it eventually if i want to.
[1]http://www.foundersatwork.com/steve-wozniak.html