black back normal in a poor tank set up.
It appears to only have over head heat, so make sure to fully inspect the snake and look for any signs of respiratory if you decide to go look at it.
I see no way to monitor temperatures except that stick on strip at the top of the tank.
Male black backs are typically pets, not something most breeders would buy to breed.

Worth $80? maybe, if the snake is healthy.
But the tank needs more heat at the least ...