Yeah, its just perspective. You as a secretary are paid by strangers because you are paid directly from the money they give to your boss/company. So it's a handout from a stranger in the way you presented a few posts ago.
Are you suggesting that when someone waits on you and your family that they are a stranger? Do you not say hello, converse with them, smile, say thank you, have a relationship for the duration of your meal? If not then I can see why you would think that strangers may pay servers. But I can guarantee that a secretary doesn't have an ounce of the interaction with the people that pay her salary (the people that use the companies services that make a paycheck possible) than a good server has with a table for an hour. They are actually a stranger more to you than a server.
Or are you seriously saying that you think servers just walk around outside the restaurant and solicit money from strangers?

I guess I'm confused. If someone buys a tv from a guy in an electronics shop then he gets a commission directly from that sale. It isn't the boss suddenly giving him the company money - it is the money directly from that sale. I think you are confused because it actually changes hands a couple of times before he gets it. Serving is more intimate (hence why the 'stranger' comment is 'strange'

) because you are cutting out the middleman - the boss doesn't get the money first and then dole it out to you in bits in a paycheck. So really, it is exactly the same but serving allows you to actually meet the customer and interact with them and gives you performance based pay. You can make as much or as little as you like. Being paid by a company from people you've never interacted with is getting money from strangers far more than serving.
I will say that when I had a repeat non-tipper they got the absolute minimum from me. A smile, a nice attitude, the order, drinks refilled - nothing more. I am getting exactly $3.54 an hour (before tax) to do that from the company. The rest (great service, good suggestions, something to amuse your kids if they are melting down, help with wine, extra checks, extra little perks, amuse from the chef, that kind of thing) I reserve for people that pay for my services. That's just smart and human nature. Why kill myself over someone that won't pay for the extras? Makes no sense. I would never give bad service, though - wouldn't be employed long that way!

Like I said, its all perspective. The money all comes from the consumers of a service - it's just how it gets to you that is different. If I had to get paid just from the employer than your meal costs would skyrocket because I and no one else I knew would do it for less than $17 an hour minimum....