[wutbrodo]

> Everyone does groceries probably once a week.

This isn't true by a longshot. The 300m figure is every man, woman, teenager, child, and infant in America, and you only need one person per family going for a weekly grocery trip. And that's of course ignoring the people who don't do weekly groceries. On top of THAT, the 30% number doesn't seem particularly reasonable either (though that one is at least the only remotely plausible thing you've said).