Oh man the fat cat . . . So cute o3o
But to answer your question I'd say there is definitely interest on the PC!
I remember a WN pet with an UC petpet (not even as cool as a fat cat) trading for a VWN UC desert aisha onsite a while ago.
You see people seeking them sometimes too, WN ones easily trade for UCs
Sounds like lots of people on here are interested too!
But yeah they definitely hold a lot of value