a) we have plastic - that's how we keep track of our expenses for IRS records - important consideration when you're self-employed - it's a heckuva lot easier to keep 12 monthly statements in a file, than keep track of all those irritatingly small cash receipts.
b) they have a food mart, where I can buy slushies for the kids after school (this is a big deal in our family :-), they have the newspaper on the stand I like to read, and they have nice people who work there. I'm with the person who won't shop at certain places because either the counter-help is rude or can't speak English well enough to be understood without a translator!!!!!!!