Let's keep this in perspective...
Instead of whinging about the cost of corkage; we should all think ourselves fortunate to be able to go restaurants that charge more than a decent bottle of bottleshop Chardy just to pull the top off one we bring along.
First world prob.
(We buy the "two for $15" wine deal at the local bottle shop etc, and stay home!
)
The OP probably should have made it a "humble brag" thread....
"Jeez; we were lucky; found a restaurant the other night that only charges $15 for corkage...normally pay way more than that!"
(I have friends who are seriously like this. Well, not really friends - total wangers actually; just have to tolerate them now and again as part of other friends' get togethers
)