I noticed the other day that Red Lobster didn't have prices for their "signature" cocktails. As it happens, I have ordered one before, and know it is about the same price as a glass of wine. Basically, I go on experience: cocktails at casual chains cost about X, the top shelf version of the margarita will cost Y more, and if this is a fancy place where the cost of the appetizers run double-digits, the cocktails will as well.
Hm, I wonder if the cost of appetizers can be used as a rough estimate for bottom shelf cocktails. Has anyone noticed?