Err, what?
If I walk down to my local gas station I can pay probably 20-30% more for anything than I'd pay at my local grocery store. If I tried to go to my grocery store without a car I wouldn't be able to take home much and it'd be a heck of a trip, even if I only have to go about 2-2.5 miles. The local pharmacy isn't too much further away than the gas station, but prices are still 10-20% higher.
Payday advance stores are everywhere.
A washer and dryer are a significant purchase. Not everyone can afford them.
I've also had a friend that, because he didn't have a car, would go to Walmart, cash his paycheck, and do his shopping all in one go when he could hitch a ride with someone. Granted, if he had a bank and direct deposit a debit card would allow him to use his bank without ever visiting, but that's another matter.
And I don't even live in a bad city with well known inner city slums. This article seems pretty applicable to my area.
Note that the poor aren't moochers: They're the backbone of our economy. After all, when you drive into McDonalds, who will flip your burger?