Edit: I don't asked on how trust works but thanks for linking that mprep.. What i mean is this it shows 0 i can't see some trust score.
~snip~
There are some sections where trust score is hidden like here in Meta section while in the Marketplace (Goods, Services, Gambling etc) section trust score can be seen on each members since it is deemed necessary to see the trust score of each member because that's where people trade or transact business, I hope that answers your question.
For you, your trust score by looking at your profile is Trust: 0: -0 / +1