I know that day/night graphics and multiple families had to be removed from the iPod/iPhone versions because of lack of memory problems on those platforms. The iPad of course has better graphics and more memory, so LDW might be able to improve the iPad version in the future, although I am certainly no expert.

I'm not sure what you mean about the prices being comparable, though. The iPad version of VF is $3.99, whereas the PC version is $19.95.