There are plenty of rich addicts. Charlie Sheen and Whitney Houston spring to mind. Anna Nicole Smith was a literal billionaire.

“Tough love” is also a real thing. Families throw addicts out all the time. the idea is that if things get bad enough the addict will “hit bottom” and seek help.

The idea of a dealer killing a customer is the part that makes little sense. The dealer wouldn’t give an addict drugs without cash up front. Dealers know exactly how unreliable addicts are.

How about the addict tries to steal from the dealer and the dealer kills them in self defense?

You might want to look up the case of Carrol O’Connor. Famous actor, his son died after an overdose. O’Connor called the son’s dealer a murderer and the dealer tried to sue him for defamation of character.