I used to think that too. However, I think it goes beyond that. Folks don't want to get hassled by LEO today in "free" states and are concerned about LEO hassles if there are future bans.Unmarked magazines are only more "valuable" to people in states that still have a ban.
We were "bitch-slapped" in '86, pounded in the rear in '94. Now we are all stocking up on astroglide for the next election!!!I am pretty sure that they have slowly stopped putting the LEO markings on the metal bodied mags (all of them). They were probably laser etched on after manufacture (?). I don't know. On the plastic mags, do you think they had to change the mold? Is that why they're still there? (Although, "grey market" during the ban mags had no LEO marking. Strange.).
As far as "bitch slapping" anyone...well, were we not all "bitch slapped" from 1994-2004?? Sucks.