I tip between 10 percent and 20. Ten for pizza delivery, and if I'm on a date, I tip 20 to look like a big spender.
lol...Ahnk!
I guess I agree with Lup, you are payed to do your job, and if you are not payed enough then you should do something about it.
Perhaps you should lobby your Governors / Senators, whatever, because if no-one does anything, then nothing will ever change.
In the UK, tipping is a reflection of the service you were given, not compulsory, and the people who work in this type of industry are payed a minimum wage.
That said, I suppose I do generally tip.