I worked as a restaurant manager (KM, DM, and GM) ...

I worked as a restaurant manager (KM, DM, and GM) for 15 years in a relatively competitive market in a major metropolitan area before going into academia.
When I say your place's service sucks. It does.
This place is a gold mine, great set up, fantastic potential, and I am sure it does very well.
I WILL NEVER GO THERE AGAIN.
I have twice been left sitting for 10-15 minutes without any form of greeting whatsoever while servers sat BSing at the break table.
The third strike out was when I was late for a meeting because the server was out chain smoking (I could smell the smoke on her breath) while I sat waiting for 15-20 minutes, my lunch long since finished, before she remembered to give me my bill.
All three of these situations are a result of non-present incompetent management or ownership.
But its your place, do what you want.