This seems to be a problem if real. I'd like to read SebastianJu's version.
A single positive default trust feedback makes an account green so it should be given only when one really thinks someone is trustworthy. And as described in the profile page the risked amount should always be set to zero if the other person sends first. It doesn't make sense that an escrow includes a non-zero risked amount unless there's something we don't know, in that case that extra information should be included in the feedback.
I really think escrows shouldn't leave feedback at all unless something particularly positive or negative happened in the deal.
I too am surprised when escrow providers leave positive feedback to the people involved in the transaction,
especially when these people are on DefaultTrust. It definitely gives people a false sense of trust and degrades from those people's rating. I really don't mind when escrow providers give out neutral feedback or none after the transaction, since there is no trust involved on the escrow provider's end.
Edit: I just took a look through SJ's rating and it appears that he puts amounts in for all transactions he escrows. Probably just a pattern he follows but he should probably change that, considering he isn't the one risking the bitcoins.
So how would you handle it? I set amounts when the trading parties set amounts. Since then i know that they dont care if the amounts are stated.
And how can a good trust rating be wrong when a trade went correctly?
I'd handle it a little differently. I don't think I'd leave users trust just because a trade goes well, since the escrow provider doesn't need to put trust into any of the other parties. However if someone asks for a trust rating after the trade, I'd leave them a neutral trust rating, unless I truly do trust the user. I escrow a transaction here and there on my main account, and although plenty of the transactions are over $50, I wouldn't necessarily trust all the people I deal with, so I don't leave them trust unless they ask. If they do ask, I usually leave them neutral trust so that others know they've successfully completed a deal or two, but that I wouldn't completely trust them, especially if the user is a newbie, or this was their first trade.
One possible problem I see with the neutral ratings for escrows below $50 is that users could just create two accounts, ask you to escrow a "trade" between them, and receive positive trust on both accounts for fairly cheap without any trade having actually taken place. I don't know if you charge a fee, but if so it would only cost them about $0.50 + 0.0001 BTC (1% fee + tx fee) to potentially have two green accounts to sell (or do whatever else with) later on. I'm not saying that this does happen, I'm just mentioning that this could be a potential problem with leaving positive feedback after a trade.
As for the risked amount, it's really not a big deal at all, but it's supposed to be the bitcoin that you risked during the transaction. Since you didn't risk any bitcoin, it technically should be 0 BTC. But since you leave a comment saying that you provided escrow for the users I really don't think that's a big deal, people should be able to figure things out.