Take on tipping etiquette

There are a lot of reasons I don't order delivery often.  First of all I hate that it takes an hour to get a pizza delivered while you could pick it up in like 15 minutes.   You would think that delivery would be so much quicker because they only have to drive to your house as opposed to you having to drive to the place and then back.   By the time you get the delivery, the fried rice I cold, the cheese on the pizza is sticking to the top of the box or the sushi has picked up some salmonella 

But the real reason I hate delivery is because I cannot figure out proper tip etiquette.   I was talking about it with a buddy two nights ago and he said he gives the same $3 if he gets a $20 delivery from the Chinese place or a $80 from the Sushi joint which  I agree in principle because the work is no more involved for one delivery guy vs the other.   But then again the difference between the amount of work a diner waitress does and a waiter at some 5 star restaurant isn't that different either and we feel obliged to pay them radically differently.   Truth be told you interact more with the diner waitress as fills your coffee 10 times in an hour yet dropping $3.15 because your bill is $16.85 seems perfectly legit while dropping anything less than 25% on a $300 dinner is a basis for prosecution in NYC or LA.  

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