I don't think that many people are choosing serving as a "career" path. In my experience, it's often young people starting out in life and sometimes it's single, struggling parents trying to put food on the table. I am more than willing to help out both. And I suppose some people might make a career out of it, and if they are really good at it, I am generous with them as well. I don't feel indebted or obligated, but I am not stingy or a cheapskate, either.
At any rate, if someone is standing (sometimes in the pouring down rain or freezing cold and snow) with a smile on their face to bring me food and save me the trouble of having to go inside and get it myself, you had better believe I am going to tip them.
So, eyelove2shop, if you know that someone is making less than minimum wage (like servers and bartenders), you don't feel like giving them a little extra if they are super nice and good at their job? Do you often stiff your server or bartender or give them a meager tip of 10% when inside of an establishment regardless of their attitude and quality of service just because they are "simply doing their job" and you base it "solely on your discretion"?
I obviously am not "policing" anyone or I would fine the cheap people, LOL. But, this is a forum where I am free to speak my opinion.