Trust matters a lot if you want to be trusted in the forum, lol. If someone has negative trust and they are looking to sell something, a lot of people don't want to deal with them. Especially if they don't want to use escrow. If they have a service or a site which they want to open, then a lot of people will not want to join that site because of the trust rating they have.
Nobody gives shit about the trust system which is being abused by people who got positive trust and give +rep to their friends and -rep to people they don't
know like.
What matters is escrow, and explanations.
As long as mods can't arbitrate on fake trust ratings and remove them, it will be worthless.