What's a good idea? The possibility of giving negative feedback anonymously ?
kakobrekla saying that the source of negative ratings is important to check, and I agree with that.
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10 You trust this person as you trust yourself. Reserve this for close friends and associates you know in person.
8 Large number of high-value transactions, long period of association, very trustworthy.
5 You've had a number of good transactions with this person.
1 One or two good transactions with this person
-1 Person strikes you as a bit flaky. Unreasonable/unexpected delays in payment, etc.
-10 Person failed to hold up his end of the bargain, took payment and ran, fraudster.