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A coin dealer who has been accepted into one of these groups is going to be one with a solid reputation backing his work. Other dealers are not going to let a shoddy one into these exclusive groups.
Another way to locate a reputable one is to find one with good assets. Perhaps he owns a nice building or has a stable presence in the local community. If the coin dealer has strong assets and roots, he will likely still be around if you have problems with one of your investments. Fakes are getting easier and easier to distinguish, but some still slip through the cracks. If you end up with a dud, you want to know that the person who sold it to you will be able to recompense you for the money you lost.
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