I have quite a few sets on the registry and find it beneficial for the reason most have mentioned. I have been offered and made some great trades because of people contacting me through the registry. I have also found out information from those collectors that I would not have found out anywhere else.
In my experience, even the "good" dealers and auction houses tended to overgrade their cards at least that was what I found when I submitted most of my raw pre-war purchases to SGC and PSA for grading.
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