It's just a $20-30 snake?...
Hamsters are only $10-15... can I buy one just to toss it in a microwave?
No?
Why not?
Maybe because that's long suffering and cruelty.
Animal cruelty does NOT stop at a price tag... sorry.
Ditto with everyone else- it's worth reporting to the ASPCA; it fits the criteria- deprivation of food, or even if it's "not eating", it's being deprived of medical care (for the sake of the bottom line- you're right). If we don't know the whole store, ASPCA is more than capable of finding that out... If it was a puppy, it'd already be reported and out of custody.
EDIT: Oh, and just to throw this out there, I took a $10 hamster to the vet to earn a $115 vet bill. Why? Because something was wrong with it, and it was my RESPONSIBILITY as her caregiver to do my best to take care of her. Did it suck, yes, but it was the right thing to do.