How do you know that they're selling it for "more"? More than what? Other breeders? When I start selling snakes I will list them for whatever I feel that they're worth, and they'll either sell or they won't. Other peoples' prices don't necessarily dictate what snakes sell for, as some people actually shop for quality snakes and professional breeders.
FYI, I just paid nearly 2X "market value" for a girl earlier this month because she was drop dead gorgeous and exactly what I was looking for, as well as coming from a breeder I trusted.