Not looking for tinfoil hat flames here, but....

Anybody know whats up with all the big-box stores now wanting your id so they can enter your exact DOB into their computer for various purchases these days? Cabelas, Gander, Sportsmans, etc... Even high-end liquor stores are starting to do it. A little arithmetic shows there are almost 21000 different birthdays covering ages 18-75 which makes it a pretty good tag within their geographical area.

Should I expect Cabelas to inform me that my purchase is denied because my DOB has exceeded its allotment of ammo purchases for the month? What's the deal?