I used to breed dumbo Himalayans and Russian Blues, but the market for them around here is dead now, and probably will be for quite some time, so I only have pets now. Every once in a while I'll breed for my snake, but only when needed.
Your ratties are gorgeous. I love the Dumbos, their ears are so sweet. We have three ratties we adopted through a rescue group and one of them is a Dumbo. I wish I'd thought to litter train them, what a neat idea!