It's not fair for you to say that suddenly you get to tip me less because you rummaged through your paper and found a coupon. You saved your money, but now that's not enough? You need to take an extra discount out of the payment I receive from you for bringing you your bottomless water glasses?
Also, I get taxed too. As a matter of fact, with my 2.38/hr wage, I get taxed so hard that I never see a paycheck, and I usually have to pay in to state taxes every year to cover shortfalls. So why don't we just consider the minimal amount of money you save from excluding yourself from tipping on the sales tax as a way to help your fellow man out. Cause frankly it's just cheap and tacky.
Going back to the water... it's really fine to order water. It's not a big deal. But if you are to look at it in a larger perspective, you could see that it is a choice that will eventually lead you to paying more for food later in life. You see not many places will charge you for water, which is exactly why you save money, but it doesn't mean that the glass of water is without cost to us. It's minimal, but follow me... You have a glass of water that maybe costs the restaurant a fraction of a cent to produce, now double it with a refill, now factor a slice of lemon (it's more expensive than you think), now you have the handling which includes service as well as sanitation and storage. It's still really cheap. It's maybe a nickle at best. But that is a nickles worth or product that we can't turn a profit on. Same goes for extra crackers, extra dressing, etc... that bottom line is not considered a loss, but it will factor into why we charge you more money for the same things every time we write a new menu. That's why a soda is more that 2 bucks now, because we know you are not drinking one soda.
This is all knitpickery, but I feel your reasoning is... similar.
15% to 20% or more on the TOTAL