David, I don't have a problem with relying heavily on dealer input for very rare, high-end chips. In the example I used, the chip was very scarce. R-4 to R-6 generally change hands on eBay with greater frequency than they do from dealer sales. The data is out there, and my educated perception is these chips values are artificially inflated, and they don't need to be. Instead, we have the "dealer" values.
I can point to countless examples. Take the 1st Issue $1 Four Queens arodie. It is an R-4 chip, valued in the guide at 150/350/500. I have recorded numerous eBay sales of this chip. Most of the averages sell for about $75. The only example I have ever seen APPROACH $150 was an SU that I sold last year, which ended up right about at $150. We are talking about "dealer" values that are darn close to 50% off of the reality. This chip has changed hands enough times recently for there to be a better estimation of its true value, IMHO, and that is the basis of my objections.
I didn't want to get caught up in specific examples, I just use this to show the disparity. I don't know exactly how the authors came up with their values, but it is pretty obvious that they didn't put a whole lot of weight on the eBay sales. I think that muddies the whole picture, and makes it difficult to conduct informed transactions.
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