What if they don't sell at $50? Food and bedding will add up to at least $50 at some point...after that point, every snake is a loss, and the longer you hold them, the bigger the losses.
Friend of mine is selling his normals to a wholesaler for $12 to $15 just to get rid of them. He's got a pastel male he's about ready to give away. If someone would offer him $40 for it, he would jump at it.
If you're happy keeping them as pets, that's understandable. I'm doing a little breeding this year (2 females only...hopefully it works out), but it's a hobby for me, so my view is a little different from people who do this as a business. I'm just not sure what angle you're looking at it from.