I find that an active member creates a reputation for himself within the community anyway. If a buyer or seller treats someone disrespectfully in a transaction then that often comes out in the open. If someone appears to be well liked by several other people then it is likely that that person has not screwed anyone over ... yet.
If I want to buy an item for sale at a forum and I don't know much about the seller's rep, I go to that user's profile and check his/her old threads, especially those in the Marketplace forums. This is where those otherwise seemly useless posts that say "Received mine. It was great, thank you" get a purpose. In a few rare cases, I have identified buyers and asked them via PM about the person they have bought from.
However... I have also seen several cases where users that had previously had a good rep have stopped delivering on deals and fallen from grace. A system for giving reputation points to members can not prevent that from happening.
In the worst case, a member had been banned for harassing other members (online and IRL), but got back a year later with a sock puppet account. The sock puppet was active for a few years and acquired quite a good rep before the identity of the holder was discovered. It was also revealed that the guy was a borderline psychopath and that during his time away from the board he had served time in jail for attempting to kidnap and molest a child. The revelation of the sock pupppet's real identity and his activities came as a real chock for us who had communicated with him, bought and sold stuff to/from him and cooperated with him on creating artwork for group orders. (BTW, this was not on a keyboard-oriented forum.)
7bit wrote:Don't know how others get these at GH.
There is a tab for it on each user's public profile page.