I think the issue with 1006s is that they are the most commonly known 10mm S&W. When the average person who has heard about how good S&W 10mms and goes to Gunbroker and searches for one, they see the most 1006s listed. Others have heard about 10mm S&Ws from forum chatter, which typically mentions the more common 1006s. Most people beyond these pages have never heard of the 1026 or 1086, and some don't even know that the FBI issued 1076s rather than 1006s. Because they are best known, the 1006s bring the highest prices from buyers who don't know about the rest. The rarer guns are more apt to slip under the radar. This is a common issue with all S&Ws, revolvers and semiautomatics, as keeping track of the different model numbers requires a whole lot of time or the SCSW, neither of which the average uninformed buyer has.