Also
-If one of the snake gets sick, both are. This makes it imposible to tell which snake's poo is which and which snake regurged for the most part
-The burm market is already over flowing with unwanted burms. If they ended up mating, what would you do with the babies? Would you feel bad when almost all of them end up in small cages and are severly neglected?

Sorry, Burms are a touchy subject to me.