If a restaurant lowers the price for a given quality of food, will it increase demand for its services? Probably
If a restaurant provides discounted prices for items during certain low demand hours (happy hour), will it be able to increase demand for its services? Probably
If other restaurants decrease prices during low demand hours, will it decrease demand for its services? Probably
> they set the price for the revenue they want, not what the market will bear
If the price they set for the revenue they want is not what the market will bear, then they lose money. Done long enough, they go bankrupt.
Am I arguing that this is always 100% perfectly true? No. Is it true more often than not that it can be demonstrated with evidence? Yes.
If your restaurant decided to drop the prices on their meals to $1, without changing anything else, would demand increase or decrease? I've worked in a restaurant too, but even if I hadn't I could give you an answer.
You provided no evidence to refute any of them except to make a weak claim of authority based on having worked in a restaurant. These are simple models that make predictions about real world outcomes that can be tested. That is, using observation we can prove or disprove hypotheses that I've mentioned. Provide evidence or move on.
Even models regarding scales of economy don't fit any firm anywhere on the planet. Firms that produce electronics don't bother with such models and theoretically overshoot scales of economy all the time but make up for it by the fact they can sell their electronics at a price that offsets their costs (i.e. they set the price for the revenue they want, not what the market will bear).