i'd imagine a lot of it comes from that episode (S1?) where Darius offers to turn his cell phone cash at pawn shop into $2K (via the sword, pitbull & pitbull breeding trading scheme)--and when Earn realizes at the end of that whole day, he still needs to wait months for the dogs to breed to get that money, and Darius winds up offering him his cell phone to get his original cash still that day?

(and then Darius comes through on his promise of the money a few episodes later, way after Earn probably forgot about it)

Darius is one of my favorite tv characters ever