To me, it could be useful for nightlife but for a restaurant it only applies to a certain segment of the market. If I am going to a 5 star dining establishment,

To me, it could be useful for nightlife but for a restaurant it only applies to a certain segment of the market. If I am going to a 5 star dining establishment, on a date, I really don't care about the emotion, because I am not interesting in socializing. Now for nightlife, I would want to be around happy people, but I don't know if that can accurately be discerned. Most people are going to say I am happy at the bar, so all bars are going to be happy.