Ok, I went on TripAdvisor and read through the "reviews". There is mention of the added charge going back at least as far as Dec. 2012 so it is nothing new.

Most of the comments indicate it approximates to 15% of the bill and when asked, the servers seem to know little about it. Which is how almost all act when asked about a "SERVICE CHARGE" or any related tax or additional charge. It was referred to as a "dining fee", "dining charge" and another mention of an added charge on a credit card.

Bottom line, based on what the servers are telling people and the fact it appears to be 15%, it is just another way of duping people into tipping more. They can call it what they like but that is what they are doing IMHO.

Since this has been going on for 2+ years, it debunks the theory that being for sale has anything to do with the charge.