From my experiences the Driver sees exactly zero of that $2.50. It goes straight to the "store" and is extra profit. Delivery Driver typically gets paid $0.50-1.50 per delivery to compensate for gas. Depending on size of delivery area, actual mileage, fuel economy and the state of fuel prices most of that gets eaten up just by working. When Katrina hit I was still working on weekends and going to school. Gas shot up from $1.80 to $3.80 overnight and management refused to adjust (even temporarily) to the situation, but instituted a $2.50 delivery charge instead. Of which we got no part I can assure you and our tips suffered. I could no longer afford to work and had to quit.
My preferences now are for frozen pizza or those Sam's/Costco deli jobs. One quarter to half the price of delivered and often quicker to the table. I keep two in the deep-freeze at all times.
And nothing extra to pay...
I don't like to reward poor service either. But, everyone should at least experience these types of jobs to get a perspective. Ever seen "Scared Straight"? If anyone ever needed convincing to get a good education they should try waiting tables for a while.
It is what it is.