7 codes(maximum) = Inferno
Inferno sells for about 100K on the Dis, this makes each code worth about 15K.
A Treasure Chair can be bought for less than that, so if I had a 75 point code, that is what I would offer for 1 Treasure Chair, but I don't.
So I guess what this all comes down to, is I wouldn't offer any 1 of those codes for a Treasure Chair alone.

sorry