No. That's a recipe for trust farming. Just go buy some trinkets from someone who hands out ratings to everyone and is in DT (and these days half of the forum is in DT)... no. "Unlikely to scam" should mean something otherwise what's the point.

Just like with the negs, which shouldn't be used against anyone you dislike, positive ratings shouldn't be used just because you're happy you sold a trinket to someone. This is not eBay. And we have neutral ratings if we're really itching to twitterize every trade.