Probably about right... They were worth 5k or so before the real world economic bubble bursted about a year and a half ago. However, if MA does take the wishlist advice and starts listing all stuff in the in game shops on the auction, that estimate is likely to change a lot since there's a heck of a lot of slots in those shops. I think they have like 200 slots in them.
No matter, how often Mastermesh points his idea out, MA will not integrate it in the next 12 months. And yes, I am certain and would take a serious bet on that.