It was often told - and I do ONCE again - that Marcus sells the Ranch218 primarily as threat. Monica must avoid every action to end there and Marcus does know that. Yes, the Ranch218 really excists, Melanie was there for a short time. But she could make a deal with Marcus. More is not publicly known so far. Marcus can have feelings for Monica, it depends on how you play her, so he even tries to protect Monica. In his ways at least...
So there is no need to review former posts, you just need to read properly.