Whether or not they are "worth the money" is entirely up to your own personal feelings. If it is worth it to you, then you buy the snake. If it is not worth it to you... Well, there you go, there is your answer.
As an example: I I wanted a blackhead from about the time I was old enough to drive. When I finally decided to pull the trigger I went directly yo Derek Roddy and bought one from him. Just one animal, because I have no plans to breed the species. Blackheads are not "cheap" animals to begin with and Derek's animals are high quality so I will let you do your own math.
Now, ask me if being able to walk down to my snake room on any given day and see one of my grail species was "worth" the money I paid. If you really need to hear my answer... Well, there you go, there is your answer.