Personally this seems really high for me, also as a flamenco guitarist and enthusiast myself, I have to say that these types of performances are specifically geared towards tourists, therefore the quality tends to be lower than if you can see a performance in a flamenco peña. It all depends on who is performing there. I understand that for someone who isn't involved with Flamenco it may not make much difference....
You may want to check out
www.deflamenco.com , which lists flamenco happenings all over spain, or if you can navigate through the spanish, the "cartelera" page of
www.tristeyazul.com . Hope you find something good!