Remus couldn't help a low chuckle at Severus' exclamation. He had told the man after all, that he wasn't cheap. Especially not with a such obviously demanding customer as Severus Snape.
He was however slightly surprised both that the man could afford that much - how many money had Severus really stashed away over the years? - and that he didn't even make an attempt at lowering the price.
Perhaps he did believe that Remus was worth it?
"Within the limits of the contract," he said with amusement, very sure that Severus meant every word he said very seriously. No joking around there.
Remus took the contract and looked at the signature, then added the date, their full names and the place, to make it even more proper. Finally he signed it, in a place deep down feeling as if he'd signed a contract with the devil.
Although, it was hardly his soul he had sold, but more his ... body?
"Well then, that takes care of business. The Goblins will know what to do with the money if you give them my name." The Goblins at Gringott's were quite unaffected by what or who he was, as long as they could sit on whatever money he had. It had never been much, but even sickles made a Goblin's eyes shine.
"A toast to that," Remus said cheerfully and raised his bottle of butterbeer.