My price ceiling for beer is about $ 12-13 bomber and $15-16 for a champagne bottle of beer. Likewise, I try be in that range for wine as well.
You get 2-3 glasses for that price --- that's all that I'm willing to pay because it's getting expensive for my budget.
Where I (hesitantly) agree with the writer is the fact that $15 beer is be approaching best in class quality status. A 15 dollar bottle of wine, while very drinkable, is nearer to the lower 50%.
What is not taken into consideration though is the wine has more overhead associated with it.
Example: While the regular Goose Island Bourbon County Stout comes out next month for about $24 a 4 pack, we have to keep in mind that's really the equivalent of 2 bottles of wine. It's expensive relative to all the other beer we buy, but in the liquor industry as a whole --- it's really a bargain.