There's a lot of high-selling ones, there was some drama over Lucatri (I think it was them?) selling a Houseteeth print for 50kg or 70kg or something like that, and Houseteeth trying to get something out of that with their own person artist's copy.

The Glimpse series has been pretty popular as well, with Opulence going for 30kg as you said, Mighty going for I think over 10kg, and the third one not as much, but still a fair amount.

To go for that much though, I would say it has to be for a popular breed, by a popular artist, of a popular or otherwise 'attractive' subject matter, if not it probably won't go for much.