Basically, he got into trouble in the first place by trying to nick enough money to support Anna in the style she was accustomed, but I don't think he would puritanically decline to sit on the posh furniture or would insist on eating scarce rations in the servants' quarters himself...and it's possible that he wanted the money from Gambit just for Silas Marner-style miserly gloating, but I really think he wanted to be able to spend it!