Anyone who breeds mixes is a BYB. A BYB doesn't need to only care about money. A BYB more often just wants to see the cute little puppies that their dogs can produce. Sometimes it's for their children to see the "miracle of life." Sometiems it's because they feel their female needs to have a litter before being spayed.

A reputable breeder breeds ONLY for the better of the breed, and you CAN'T breed for the better of the breed when you breed mutts.