I do wonder what happens to all those hatchlings, especially the normals or not quite so special morphs. I agree that if you are just looking for a pet, it's nice to find a "used" snake.
That being said, our first one was a 2 year old BP that my daughter saved up her money to buy the snake and enclosure, etc. Unfortunately she has a nasty habit of biting, and sometimes it's very random. She has gotten somewhat better, but it certainly wasn't the experience my daughter was looking forward to, from these mostly docile animals. She's not one that we show to guests or even handle that much. I suspect that's why she was for sale.
Our second BP was also "used" and I bought him from Craigslist and met the people at a gas station. Taking our chances, but the price was right, and they assured us that he was very docile and had never bitten anyone or even tried to. He was sold by an older teenager who was going away to college. He has turned out to be a delight, and makes up for our first one's nasty temper.