I have noticed that Wawa (mid-atlantic convenience store often paired with gas station) is starting to set up a supercharger network, sometimes even when there is no gas station already existing.

Anecdotally, I agree with your assessment that EVs will cause more purchases.

I've never spent more than 5 minutes in a 7/11 in my life.

The point of those stores is to get in and get out quickly. It's the exact opposite of an EV charging station. In fact, most 7/11 in my area enforce the 'no loitering' rule.

I don't even think that 7/11 managers want you there for more than 5 minutes.

Restaurants or shopping malls I'll stay for 2 hours regularly, and a few level 2 chargers can actually get me 50 miles of charge in that time. That's where the EV chargers should be.

But you need more real estate for the same number of customers per day, so it's a trade off.