I recently got a warning for leaving positive comment on a particular, unmentioned member, in his/her thread and I feel that it would be for a great benefit to the buying and selling community of this rule was lifted. I'm not writing this thread as an appeal to my warning, I didn't read the rules and I deserve the punishment that I received.
However, I honestly believe that allowing users to leave feedback on the seller/buyer would be of great benefit to the community. Because members are aware of the buyers/sellers previous history, one can determine whether or not it would be a good idea to deal with said buyer/seller.
With the current system, each transaction is essentially a leap of faith; members deal with others hoping that what they get from the transaction is correct and fair. Having access to feedback at their finger tips allows members to be smart about whether or not they should make the deal.
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Leaving feedback is a wonderful idea!