I realize that they overprice the reptiles that they do have, but you've got to consider that generally speaking, people have a certain cap on what they'd spend on a pet regardless of what its actually worth.
While people may spend hundreds if not thousands on a dog, snakes aren't viewed by the type of people the shop at petsmart/petco as the type of animal to spend that kind of money on. I'd guess that 75% or more of the people going in there are spending money on their dogs.
I could be "out of the know," but I'm not convinced that the price or supply of albino ball pythons will be at the levels appropriate for mass retail in 1-2 years...to sell at petco/petsmart, we're talking hundreds to many thousands of individual animals....if anyone else has anything concrete to share contrary to that, be all means go ahead...