I delivered pizzas for the better part of 4 years to pay the bills in college, so I can answer any of your delivery-related questions
Generally, only a part of that delivery fee goes to the driver (the rest covers store operating costs), and it barely covers the gas on most runs.
Delivery drivers make somewhere between serving wages and minimum wage (~$4-$8), so if you don't tip, they are making less money while taking far more risk than any other minimum wage employee.
A standard decent tip in most areas is $3. Anything below $2 is a slap in the face, and you had better hope I don't deliver to you again (I have done unspeakable things to pizzas). $4-5 is a good tip, and anything over that is excellent. This is assuming that you live within about 5 miles of the store. Tips should reflect the distance traveled and accessibility of the location (tip extra if you live on the 4th floor), not so much the total of the bill. If I can carry it all in one trip, it doesn't matter much whether it was 1 pizza or 3. But obviously if you're ordering for a party, tip $5+.
BTW, I just watched the video and laughed SO ****ING HARD, because I've wanted to do that same thing so many times
