I have been both the recipient and the giver of more than a few RAKs (random acts of kindness).
Just recently I paid for an elderly lady's carry out meal at Golden Corral. It mattered not if she was homeless or well invested. The point desired to be made was that there are good people in the world that have no ulterior motive other than making someone's day better.
After finishing up a breakfast at Shoney's, I asked for the check only to find that a nice couple had paid the bill for me as a way of expressing their support/recognition for my responsible OCing.
In our dining experiences, many of us tend to tip better than the average customer. Such not only helps with our acceptance as OCers, but also creates a memory that indeed good service pays off.