Hi,
Defining a list of reliable sources is just about as far as you can go. We use the same system in our classic car clubs. We will not post any lists of unreliable sources, just remove people from the reliable list when they turn out not to live up to the expectations, or when doubt occurs.
Of course it's difficult to define a 'reliability factor'. Imho the most important factor is the willingness of the seller to offer a money-back guarantee when the object sold doesn't meet expectations. Another factor is more difficult, it relies on the willingness of the seller to act in an honest, responsible (to the collecting community) way.
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