..but I have been getting very annoyed about how centralized the trust system is...
A lot of people are.
Another example that I forgot to mention here is MemoryDealers. As a DT2 you can not neg. rate him because: a) You'd get excluded (by HostFat). b) You'd get neg. rated after he gets included. If anyone really deserved a negative rating for consistent shady behavior, then it is him.
..just because the people you set 4 years ago were the right people for the job then doesn't mean they are the right guys to fight the scammers now...
Most of them just do nothing at all (at least not if it doesn't financially benefit them).