That are really high budget, and extremely succesful both in reviews and in box office.
and then a few years later they make a straight-to-dvd sequel which doesn't even has half the budget of the original film?
Tarzan 2, Mulan 2, lion king 2, cinderella 2 (I think its on the 3rd by now), hunchback 2, the little mermaid 2, fox and the hound 2.
I could go on.
Why is it like that? I dont think that they are actually trying to make more money since it seems pretty obvious that making a full fledged sequel that goes on theaters would earn them a lot more even if it's not as good as the previous one, or good at all (Cars 2 for example)