Honestly, having high trust isn't really that big of a deal unless you trade a lot. The only thing that having my trust allows me to do is ask the other party to send first whenever completing a deal.
If you're actively leaving people negatives (like Vod, xetsr etc), being on DT (Default Trust) and having a high number is probably more trouble than it's worth.
There are other advantages when you have high numbers.
-rarely send first
-special rates on sig campaigns
-free stuff / vouch copies
-priority on trades - people know when working a trade you will hold up your end without questions.
-escrowing (personally I never seek to escrow, but people ask all the time so I started offering it).
-people tend to take your word on things
etc...