There seem to be two dominant viewpoints that come to the same conclusion for different reasons. Essentially these can be summarised as "Booth babes are an insult to women", and "Booth babes are an insult to customers"
That is to say, some people are offended by the idea that they're going to be so impressed by the hot chicks that they'll spend tens of thousands of dollars on a security product. I think a lot of the attendees agree with this viewpoint and are pretty neutral about the first. Although a lot of older, more conservative, (and paradoxically younger ultra-progressive) attendees will agree with the first.
Presumably there is a voice for "I like booth babes", but it's a pretty tricky argument to make compellingly. Anyone who claims they need them is basically claiming to have a bad product.