if my account has positive trust is it value pushed up?
If you ask me then its NO.I don't care if you have a Dozen of Trust but do care If you have a single legitimate Trust from Default List.
You should always try to stop the tradings of accounts that involve green trust as if it goes in wrong hands can lead to some sort of scams.
else there is no point of trust all remedy lies in Escrow , use Escrow for all small to big stuffs and stay safe.
You might not value the account but it does add more value if you check the digital goods section. People will obviously pay a little bit more for trust, sometimes for good or bad reasons. As shorena said above you probably wont be able to scam for much if anything at all so it's probably not worth buying an account to scam but some feedback might make people trust you more for sure.