When the Pet Journal first appeared pre-MoP, I had 1170 pets... I love all my toons equally so of course I had to get as many pets as I possibly could for each of them! And I'm such a hoarder (and a cheap one at that), that I couldn't bear to just dump any that could be sold or given away to friends once we could cage them. It was heartbreaking having to release the extras I couldn't cage into the ether . Took forever (and more than one banker's new guild tab!) to get them down to the 500 cap so I could finally catch some in the wild!
I'm taking a break from AH trading with them atm (it's so time-consuming!), but I think I've made close to 100k gold across a few different servers selling the extras, and still have well over 100 in various bankers' bags and banks. Sometime I'm sure I'll relearn many to level again once I've gone through all the trainers and caught'em all in the wild.
So I've always wondered... anyone else have ridiculous numbers they had to cull down to get under the cap?