I completely disagree with the entire premise of this post. On Armslist as of 01/27 @ 12:00PM there was a decidedly larger of number of 9mm guns for sale verses 40 cal guns.
And if you follow the link they ratio of 9mm to 40 is always higher...
http://www.armslist.com/classifieds/...&tag=9mm-luger
Just another thread to start a caliber war