Drivers rely on tips since they don't make the same pay & deal with soaring gas prices and wear/tear on their own cars. I tip $1/pizza for delivery, more if it's fast, hot & the driver has manners!
If I go into the store, I don't leave a tip to pick up pizzas. I've worked retail & food svc. In-store employees shouldn't get tips unless you feel like they went above & beyond in customer svc.