I have went ahead and created a sub-section to the marketplace.
Completed sales/trades will now be moved into the completed transactions section.
Thank you, we value your suggestions!
P.S. Tidying up is in progress.
iTrader would be brilliant as long as it is somewhat monitored and strict rules are implemented. I also believe it should be made clear if it was installed, to not trust users purely based on iTrader score.
If we were to introduce iTrader, we would hire additional members so that they can monitor the marketplace as a whole and any feedback left. We could have iTrader modified so that it lists the transaction amount too.