In the SF bay area, I frequently bring my own wine. $10 to $20 is a typical charge, and some places with a $20 charge have a reasonably priced wine list with nice selections, so I don't bother, unless I have something I want to drink. If they charge $20 and give me a 50 cent "wine" glass with a thick lip, I find that offensive. If they serve you in fine stemware, then it is justified (and sometimes they will decant, etc.) Often if you buy another bottle, the corkage charge just won't appear. ^ Depending on the local culture, it is completely acceptable.