i agree to the main point of your opinion: animals eat animals, and the value we place on those animals is a personal belief. however supposedly these pets on craigslist are meant to be given to a loving home. but in my own opinion, just like with snakes, there are so many people that don't research and end up over their head with an animal they can't care for - mainly dogs. this adds to the current issue of craigslist adoptions. also, imo, there's no way a person that cares for their pet would place a CRAIGSLIST ad to rehome them.
this all ties into my disbelief for the OP. if you own a retic that big, there's no way you haven't established a reliable source of food, let alone the hassle of trying to ensure your feeders are acquired consistently. frozen is consistent, cheap, and hassle-free. it all smells like bologna to me, which is why i wanted to share.