At first, in the trailers, previews, and all the publicity for MOP people talked trash about Pet Battles and how it would be stupid/waste of time/"spend your resources on better content Blizz instead of this pokemon bullshit"
But now that MOP is live, it is no secret that a lot of players are actually addicted to Pet Battles.... I've already heard reports of many players get sidetracked from 85-90 because they went to try Pet Battles, now its eating up all their time
Loads of players who didn't upgrade MOP also have Pet Battles to enjoy now, it's available from base accounts (Wotlk) through to Cata - and for people who are unable to visit Pandaria or get to Lv86 this is now a huge part of the game for them
PET BATTLES FOR F2PS. WE DEMAND EQUALITY FOR POOR F2P KIDS!!!!!!
WE WANT WOWKEMONS NOW!!!!!