Unfortunately this is no longer an apt analogy. There are infinitely more restaurants than airlines so you have far more options. Both restaurants and airlines know this and respond accordingly. Add the pressure for low fares and the inevitable "fare wars" that occur, it's no surprise that air travel is a commodity now.

I think a McDonald's is a better analogy for air travel these days:

You order a Double Quarter Pounder and receive a regular Quarter Pounder. Then:

a) The cashier stares at you blankly (at best) or is annoyed that you've reappeared (more normal)
b) They add the additional patty or replace the sandwich altogether while pouting or sighing heavily
c) You get nothing else except more calories than you need