iTrader or Marketplace Rep System

I think that Mac Forums could provide a better marketplace system if we implement marketplace specific reputation systems such as iTrader. This will allow the buyer or seller make opinions about the person they are making a deal with. Of course there is current reputation throughout the entire forum; however, that does not always consider marketplace transactions. With iTrader (or something like it) we can provide more trust with people who deal in the marketplace, and possibly develop a bigger marketplace making us more active.

What do you guys think?