Not going to happen.
For a start this would eat into WGT's pockets twofold - players upgrade = loss of sales and secondly this would cost money to programme with no return.
Even if WGT took a cut, the cut would be less that the actual sale of that equipment so revenue stream dries up.
Yes it costs money to run a website (equipments, programmers, employees etc...)
I believe, that once or twice a year, you would be able to set up an event, where players could give their old clubs to less fortunate and die hard members...
I also believe that WGT could give back at least 1/2 the valued equipements to the sellers. (even if it is only a few times a year...
something to work on and improve WGT