There are plenty of attractions outside of Disney or Universal. I'd guess no more than 10% of rented cars have zero activity.
Regardless... these are families who live in South Florida. Cost of driving is a tank of gas each way. Can drive right up to the hotel's front door, no Uber. Can visit both Disney and Universal. Mom or Dad can easily go to convention while kids go to parks, etc.
It's a very rare confluence when paying more and giving up the freedom of a car makes much sense.
Regardless... these are families who live in South Florida. Cost of driving is a tank of gas each way. Can drive right up to the hotel's front door, no Uber. Can visit both Disney and Universal. Mom or Dad can easily go to convention while kids go to parks, etc.
It's a very rare confluence when paying more and giving up the freedom of a car makes much sense.