I dont think that you compare a full CG film with something like Jurassic Park, its a different kettle of fish completley, as THX said

As for the toy marketing, i'm sure its more viable to make soft toy penguins and fish from a movie designed for kids, hell theres enough out there without having to attach it to a film and they seem to sell.

As for other movie merchandise (like in the case of the terminator movies etc) it has to cater to the audience and some of these are almost cult (looks at the tortured soules series inspired by Spawn) which is why they are marketed.

On this front i'm waiting for the "New" Transformers to come out and have a re run of when I was a kid as its a new generation to sell them to.