Snake owners on Craigslist

[Kera]

So I was originally searching for places to buy snake supplies for (very) cheap but ended up going onto Craigslist looking at snakes for sale. Life of a teenage herper. But a lot of these owners obviously have pictures of their snakes and their enclosures and some are in some bad enclosures. There was one that looked like it was in a too small tank (maybe 15 gal. for a 1 /12 year old rtb) with what looked like patterned towels. One hide and one water dish and that was all (plus what looked like a heat lamp) which I understand the hide and dish are okay for a snake that doesn't like to hide much or anything, but I didn't see a thermostat or any sort of temperature gauge. I also saw one that was in a properly sized tank and everything but it looked like it was on ferret pellet bedding or something. Is there anything like that for snake use? I'm just curious if this stuff is okay or not...still pretty new to this. But then there was what seemed like an awesome snake owner who HAD to get rid of his 8' RTB since he's moving. He seems as if he cares about his snake, since he said that he would much rather sell his snake to someone who has experience with reptiles and such. I just don't understand why some people buy a snake or lizard or any pet if they don't intend on giving it the best they can give. Let me know if I'm just being close minded or something but there's my two cents :P