Posted by Dusty

Because pets don't just magically know how to walk and not get stuck on walls--they need AI(even if it's basic) to do that. AI needs to use the cpu of the server to perform calculations, and the more pets there are the more cpu they will use up. Having free(or cheap) pets means there is no barrier there to stop them from flooding houses. This is why having the 25g hermit crabs was a bad idea and their prices have since been raised. I have, more than once, walked into a house to see more than a hundred hermit crabs walking around for no other reason than because they were cheap.