10xx Mags' Good Side . . .
. . . are the pistols into which they fit.
In the wake of the FBI's infamous 1986 "Miami Shootout," Smith & Wesson, along with the FBI and Winchester/Western, were about, what, 25-30 years ahead of just about everyone else in the handgun universe when they combined to introduce the 10mm pistol and ammunition, originally developed by the late Jeff Cooper, into law enforcement usage.
A handgun enthusiast par excellence, "for many years Jeff Cooper studied the ballistic performance of handguns. The culmination of his work was the 10mm Auto cartridge that incorporated all the features Cooper believed necessary for a law enforcement cartridge. Following its introduction in 1983 along with the Bren 10 pistol, a flurry of interest enticed Norma, Federal and several other ammunition makers to add this caliber to their product lines. However, the anticipated ground wave of interest never developed. Today, the 10mm Auto cartridge is near extinction." - (source: Ammo Encyclopedia, 5th Edition by Michael Bussard, Section XI, Chapter 73, Sporting Pistol, Pg. 751, ©2014, Blue Book Publishing)
While there were various mechanical teething issues that didn't bode well for the FBI's project, the biggest problem, as primary mover FBI saw it, were the female agents who had considerable difficulty in handling the firearm's (Model 1076) grip and recoil (source: "Guns of The FBI" by Bill Vanderpool, Gun Digest Books ©2018).
Out of the above scenario came the S&W .40 Caliber - a 10mm projectile restated - the powder charge of which carried somewhat fewer grains than the 10mm. While a good story in and of itself, such is tangential herein.
Bottom line from Ol' DC's perspective,
still, is the S&W Model 1006 had 26,979 units produced from 1990 to 1993. Others in the series, like the Model 1046 had only 151 units (yep) produced in 1991, only (source: Blue Gook of Gun Values,
Blue Book of Gun Values).
No matter the specific model, it's hard to see the value of an S&W 10mm going down anytime soon - unless an individual firearm is mean mistreated (source: "Mean Mistreater," Grand Funk Railroad, 1970).
Sorry, I'm an Old Guy . . .
Later.
P.S. My firearm collection includes a factory acknowledged Colt's Manufacturing Delta 10mm prototype, the frame of which is based on the Colt's Governor .45 ACP and additionally is cracked from the stress induced in testing by the 10mm Auto cartridge. And she really, really is "Some Kind of Wonderful," Grand Funk Railroad, 1974).
P.P.S. Sevens: I love you, man.