Since you've not given the seller the opportunity to make it right with you, I don't see how that makes him a bad guy? And you said he ate rats twice for you when you first got him. I doubt that he "programmed" him to eat fine for you twice, then suddenly switch to mice.
I fail to see where the seller did anything wrong. The BOI would be a great place if you have a genuine complaint that you can't get resolved man to man with the seller.
In the future, if you have a complaint about someone - posting about them in someone else's picture thread is not the place to interject. A thread down here does quite nicely.
I did a quick Google search for Paul Miles and Boa Barn and found contact information rather easily. Why don't you try contacting him now, rather than calling him out as a bad guy? Would you like someone doing the same to you if they never contacted you about their un-happiness in a deal with you and didn't give you an opportunity to respond?