Charitable Tipping

So I go to pick up some takeout at Tony's in Birch Run and something very curious happened; they asked if I wanted to add a tip to the bill. Now, when we eat at the resturant, we tip very appropriately. Asumming the service was good, a $26 bill will generate a tip of 5 dollars. However, if I am the one bringing the food to the table (dinning room table at our house), getting our drinks (from my fridge), getting our refills (from said fridge), solving all the small problems that occur during dinner (napkin related issues mostly, we ordered chicken wings which were delicious by the way), then I really don't feel like I should tip the guy who handed me the bag. Now I realize that there is a lot more to preparing our dinner then handing me a bag but at some point we should recognize what the $26 is for.
Waiters and waitresses work baisically for free with the hopes their customers tip well. However we didn't use the services of a waiter or waitress and cooks get paid a full wage. I guess the thing that really got me was how the guy who rang me up not only asked me if I wanted to add a tip, he actually staired at me waiting for an answer and appeared deflated when I told him: "No, we're good."
Now I have been using the term "tip" for what the guy who rang me up was asking for but I am not sure that is the correct term. Forgive me but I am at a bit of a loss to find the correct term to use. It is that term you use when you give people money who did not fully earn it. You know, you think of this term when you see the "tips" cup at the drive through at Mcdonald's or at the convience store when you are buying soda. Charity! That's it. I knew I would think of it. It would seem the new business model for companies involves the teenager taking your money at the end of a transaction is also begging for it.
The problem with this is that it gives traditionally good tippers a bad name because they continue to abide by the rules of tipping set up by the service industry themselves: 15% of the bill (without tax) if the service was good. Now, not only has it somehow inflated to 20% despite increases in the price of food, the people requesting a tip is anyone who hands you a bag.
I realize times are tough but they are tough on this side of the counter as well. People are getting takeout to save money on tipping but if you stick them with a gratuity requirement anyway, you will find your cooks needing a type of charity as well: unemployment.