Petco is the worse example you could use for correct animal husbandry.
Multiple snakes per enclosure increases the probability of problems significantly. I wouldnt reccomend it. The first snake I ever got was from a pet store and housed with multiple snakes. It ended up having mites, ticks, dehydrated and malnourished.

Just because an animal survives in a certain situation doesnt mean its good for them.

I know someone who survived a Vietnamese prisoner of war camp but I wouldnt reccomend those living conditions to anyone.

Just sayin.