Does anyone else find it extremely sketchy that this nosey bastard wants your date of frickin' birth just to check out?
 
I use Bitcoins largely for their increased level of anonymity (to the extent you can have something physically shipped to you "anonymously"  ).  Not so I can give anyone that hacks you a simple one-click identity theft of all your customers.
 
You just lost a $600 order, friend.  Let me know if you wise up, because you have a good storefront - But damn me if I'll give you more than my shipping and email addresses.