Posted By:
barrysloateMichael is correct, but his answer is not complete.
Many of the collectors who build very large collections very quickly are often the first to burn out. I have seen it many times, Copeland being among the most prominent. When one of these collections comes up for sale, there will be a new infusion of high grade material into the marketplace.
And of course it will be quickly gobbled up by the next generation.