If someone has 50 positive feedbacks and 1 negative I don't think anyone would think of it. On the other hand if the have a total of 10 and 3 or 4 are bad I would steer clear of them.
I have been doing business on e-bay since they started and have never been cheated. I did buy something one time that had the serial number ground off. Gee I wonder if it was stolen. :confused: