The problem with provider's black list: some ill-intended providers can list good clients on blacklists, preventing other providers from seeing those clients.
scenario 1: client having a bad day, sh*t happens, one time thing, he's usually not like that. He gets listed
scenario 2: provider gives awful B&S service, client rightfully mad at her, maybe asks some money back. Provider pissed, he gets listed
scenario 3: provider wants revenge on old bf (who might be a very good client), he gets listed
scenario 4: you all know this, provider wants to keep client to herself. he gets listed so others don't see him
etc....
basically, provider's blacklist can be abused.
Here on merb, if a someone says a provider is not good, others have the liberty to give their opinion still. I don't imagine providers have such a sophisticated system of review (or do they) for clients.
how do you providers trust the authenticity of names on a blacklist. Do you absolutely not see those clients, or might you give them a try