Flutterby™! : receipts by email

Dear every store I shop at,

I will happily give you my email address, read email you send to me, and use a "loyalty card" or other such program that allows you to tie individual store trips together into a customer profile, if you'll email me my receipts in an easy to import into a spreadsheet format. Say, comma delimited ASCII.

I'd love it if this process can be fully automated, so that I can sort and search all purchases later without having to save individual receipts from email, but however we work it out: I want my receipts in machine readable form. You want customer loyalty information, and more of my eyeball time for marketing.

Let's make a deal.