Have you been to a 7-11 in the US? I would be quite shocked to hear anyone contemplate eating much of the food if they could afford not to. Nothing at _all_ like the ones in Japan.
The way my parents tell it, 7-11 was actually decent in the US in the 90s. Set up an international division with quality goods; then the P&E thing happened where the international division got sold off and the US operation was stripped to bare bones and it's never been the same since.
Funny enough, it was bought by a Japanese company "Ito-Yokado".
Note that 7-11 in Japan and 7-11 in the US don't share anything beyond the logo. They have been completely separate businesses since forever.