I dunno, I usually like going to conventions so people can try to sell me things.
Thing is, these 'booth babes' acting as total sex objects *do* sell things...
I'll explain in detail for those who disagree: the ladies grab the typical convention-goer's attention long enough for the sales-critters to suck the guy in and start making the pitch. Our victim is now too damned busy trying to steal glances so that he can lick every inch of her body with his eyeballs. This in turn means that his attention and concentration are now shitty enough to keep cynicism at bay, but still present enough to suck in any buzzword and pretty chart that gets shoved in front of him.
It's a salesman's dream: a horny distracted dimwit with access to purchase order numbers.
Now let's remove the barely-dressed ladies, and what do you get? People that *pay attention* to your sales pitch. People that will start asking hard questions. People who will have their cynic shields on full-power. People that take way more time to work on. Fewer prospects that even bother paying attention to your booth in the first place.
I suspect that after a year or two of "empowerment" (or whatever they want to call it), it won't be attendance that drops, but vendor participation. When vendors see lower sales numbers off the convention, they can no longer credibly justify the expense and time of going.
Me, I couldn't care either way - I usually bring my wife along (at personal expense), so that we can spend off-hours playing tourist and eating at nice places (and she goes off to museums and such during the day). On the other hand, I know exactly what a younger version of me would want... and the evil salesman I keep locked up in my brain knows just how effective sex is to get what he wants by using it.