If I were to come up with a theme park, I would definately decide to have the people pay once at the gate for unlimited ride access. It just seems fairer to the guests, especially for families who come in large numbers. That way, if they have say 4 kids and 2 parents, and some of the kids were too small to ride alone, then the parents would have to buy an extra token for them to accompany their child.
Tokens are a huuugggee waste of money. Just look at any fair or carnival. If you don't buy the all day ticket (which is still a ridiculous waste, unless the fair you're going to is damn good), you're paying about a dollar a token, and some rides take 2 tokens to get on per person.
I know I never like it if I go somewhere and my parents have to pay $60 for a whole whack of tokens, knowing that that would get 2 people in to Geauga Lake. It pisses me right off, at how rip-off-ish carnivals can get.