Thanks!This is a post from Orientexpat.com that explains it fairly well - except a bit out of date with regard to barfines:
Typically the Coyote girls are better looking than the standard go go or bar girls. Barfines are higher as the owner (and girls) make more by dancing in the bar generating tips and ladydrinks. The higher barfne (now and not going with custoners in the past) is to keep them in the bar most of the time.
Apparently there is a loose connection to the phrase coyote girl as used in Thailand, and the 2000 film, Coyote Ugly. Also the film was inspired by the real life NYC club named Coyote Ugly Saloon.
At least it sounds that way to me...
http://www.imdb.com/title/tt0200550/