I agree; package prices can be helpful. Also, Florida residents can get reduced prices. You cannot possibly find that much variety of entertainment for the price, and you cannot possibly see it all unless you have several days, even if you move quickly. The people are friendly, and the place is kept spotless.
Personally, though, I think Walt had a secret dislike for children. What happens when a 3-year-old comes face-to-face with a six-foot-tall rat? I think he secretly chuckled all the way to the bank….