If it is making money: People try to make it (to make the money)
Thus the price falls.
If it is your pet project (and not being made by the world at large): You don't sell it, people see pictures, people want it for themselves, the snake is seen as highly valuable.
If the snake is seen as highly valuable: People (the brainiacs I was talking about before) end up making it to get the money, thus the price falls :/
It's a viscous cycle.