i don't think there is to many
first because i wasnt here way back and would not know how it was way back besides what i see now and that really the thing . the idea in many business is for them to grow and a few years from now we will be double the amount of owner or less. who knows.
But then we are from different time zones and we all have a first life which can come at the most unexpected times to claim its position which mean that its impossible to make it to all the auctions and that is where having several comes handy. After all you don't have to go to all but the ones that suit your schedule. would it be nice to have to wait like a whole week for example to be able to auction your kitty and if something come up and you cant make it you have to wait for a while again? when with several auctions you can simply chose the one that suits you and the person you know will do the best job for your kitty?
one thing i am sure is that the majority in the kittycats community don't do auctions or else the ones we have going on wouldn't be enough
and these auctions are a rare ocations where you would see most of the breeders with one or more kitties at the same place without crashing the sim
so yeah i dont think they are to many, you dont have to go to all and all are not the same