Feature suggestion: Karma-system for Swap market

[individualpirate]

Currently swap market is overrun by absolutely horrible deals, to the point where it may be difficult to spot a decent one.
In order to make the swap market more useful, it’d be useful to implement a system of Karma similar to Reddit, but where your upvote or downvote is worth as much as the amount of FSN in your wallet, and you’d not be allowed to vote on your own swap deals.

Karma is likely best applied not to the trade deal, but to the wallet issuing the trade deal. It'd also be great if comments could be added to the trade deals, both by the issuer and by voters.

Initial Karma should equal the FSN (FSN+BFSN) in your wallet.

Primary sorting of deals is then according to the karma of the issuers, where it's possible to filter out negative karma issuers completely.