from my understanding( and sorry if someone already said this) its no different that ebay execpt you pay per bid? same risk of not winning the bid and same chance on saving a ton of money?
and if the snakes are coming from breeders you would normally buy from anyway i can see the appeal and value in something like this. its not a scam either if they are completely open about how they do buisness. you either accept it and use it or you dont.
Now would i personally do it. Im not sure. I think i would have to have someone i know directly that did this and had a good experience before i would jump on.