FL-NC
Member
Popularity and availability. The same reason used 40's are always cheaper than a similar used 9 of a similar type (a Glock 19 vs a Glock 23, for example). From looking at ammo for sale lately, it seems like the supply is in favor of the 9mm vs a similar product for 40, with the 40 always being a little more expensive. I don't see the 40 "dying" or fading into total obscurity like 357 Sig, or 9mm largo just based on the number of 40 pistols already in circulation and continuing to be made, along with it continuing to endure among some agencies.