It's hard to tell, ressisives hold their value longer, look how long albinos have been around and there still 300-500. As for single gene and basic doubles(bumblebee) I think a lot of breeders get them as a result from pairings, I don't believe a lot of big breeders are breeding to produce bumbleebees anymore. Ex- spinner blast x enchi fire could produce spiders pins bumblebees lemon blast etc.