I really like the idea blueh! I have seen all the worries people have expressed and i think it would be just logical to sell old hats more expensive! Players that have missed a great hat/furniture etc. will be willing to pay more in order to get it. Also, that would solve the noob problem. Furthermore, if the old hats are sold cheaper, then nobody will buy the hats in the stores and will just wait a month to find it with a reduced price.
My thoughts on the subject <3