> That’s like $9 a bottle at the liquor store so wholesale for the restaurant would likely be much less

The maximum discount you can get through the state system is a 10% case discount. If you can direct order it you can get some larger volume discounts, by right that basically means PA produced wine.

The markups used are largely necessary not because of the cost of the wine. But the cost of the staff to pour it, the room you're sitting in, the liability insurance that covers the establishment, the licensing costs that allow it to be poured, etc.

At a a restaurant you have to pay for everything else that surrounds you.