Okay, so on a few other sites, I've seen that people can give you "Reputation Points" when you are considered trusted by them. I think this would be a good idea since then traders could see if other members are trusted before trading with them.

P.S.- Sorry if this has been suggested before =P

This is not a Graphics Design Website.

This could be easily abused elvensmite.

will not happen. would be abused. some users would make multis to give their main accounts positive ratings, and some users would receive bad ratings because others don't like them...
and this was suggested many times.

easy abusable

If you trust someone, you don't need a symbol or whatever to know that you trust them..Just because you trust them doesn't mean anything..I don't see how this would help anything..probably just hurt things more..

Like above..easily abusable.

No. I bet it wouldn't be accurate. :X

No sorry, would get abused tons.

vouch

Suggested many times in the past, it will not happen as it can easily be abused as said above.