Well, the other thing to consider about Jobs + Wozniak is that they were young at the time. The young are more apt to take risks -- and they were also friends with mutual interests beyond just computing. Did Jobs tend to use Wozniak? Yes. But Wozniak had to be willing to go along on the ride. Also, being young, they had their parents to still fall back on, whereas if you're older and being asked to take a risk, you have to consider the web of financial and personal obligations that have grown up to ensnare you.

EDIT: Typo killed.