Initially wanted to ignore this, however it seems like it gained more attention than it should. My opinion is simple: Even though you have every right to give someone a negative for any reason, I feel like a neutral is more appropriate here.
I don't think I'm abusing the trust system.
-snip-
You are not. You are using it correctly.
Seeing that quickseller sold accounts, even DT accounts and never got a negative trust rating for it, yeah I guess it should be a neutral trust rating.