The trouble with people advertising parts for inflated prices like this regardless of what their willing to take for it is that joe blogs see's it and thinks blimey those old wheels i have sitting in the shed must be worth that too so on ebay they go, and so on and so on. Then before you know it the going price has doubled as theres always some born again biker with lots of disposable cash willing to buy them.
I appreciate parts like these will always rise in value but i think a lot of it is artificial caused by the above, one prime example is RVF400 rear wheels ive watched them nearly triple in price over the years.