>>1700819Average distance to supermarket in suburbia is 3.5 miles, it's not long or complicated journey by car.
When corner stores are nice convience, they are overpriced and have limited choice of goods. If you are vibrant and brave urbanite who lives alone and doesn't cook regulary corner store is fine to buy here and there eggs or bag of coffee. But if your are are housewife who runs household with several kids amount of goods consumed becomes substantial and running to corner store doesn't cuts anymore.
Driving to supermarket 1-2 times a week and getting everything in bulk saves substantial amount of time and money.