I mean I don't really know how else to put it. No group of grown ups standing around at a conference would notice the number of "booth babes" and then get upset. Something which happened to gamers a little while ago.
So a bunch of pretty girls who probably didn't like being there in those places very much to begin with lost their jobs. The hyper insecurity of attendees at these conferences and previously mentioned "weirdness" are contributors. Many, from my research of the opposition to "booth babes" are insecure that they are not regarded as adults due to "booth babes" being around. Even some people in this thread have stated that they don't like being marketed to as knuckle draggers.
Well. The gaming industry is largely populated by adolescents, that is why the marketing that is chosen gets chosen. If they were adult enough to not mind the presence of "booth babes" and just enjoy themselves at the conferences, investigating the technologies they are interested in things could be a lot better.
But they're not. Things are weird. Interactions are stressful and now marketers need to awkwardly conceal their attempts at marketing.