Good for you. Any advice? I manage to sell just one kitty, and after that, I couldn't even see them on the market.
The network is slow and I'm not sure if my information's are limited or the game rules are absurd. 
There is no market price for any cat, there is no information what cat is special and why, yes, there is a list of cattributes, but I really don't see the connection between that and overpriced cats.
Also, every transaction needs to be payed, even if you are canceling sale that reached final price after the time is up. Also, if you want to breed your own cats, you have to pay for it.
The game is designed for creators to earn as much as possible.