There's nothing wrong with it, certainly. However, the correct way to have women around at your conference is to make your conference interesting to women in the field, not hire them to serve beer.
From the perspective of wanting women around, this "perk" basically says that they've given up on getting women in the field to want to come to their conference, and the only way to get them there is to hire them. It's pretty lame.
This, I agree with. My job is not to change society though. My job is to enjoy my life and guide my kids. That's it. And I'll enjoy it more with some nice women around.
Who said anything about changing society? There are ways to attract more women to your conference, and hiring beer ladies and playing them up as a perk is almost the exact opposite of that.
I'm saying as an attendee. If the organizers can't do it otherwise, I'll take the servers. Nothing like idle flirting with someone you'll never talk to again.
From the perspective of wanting women around, this "perk" basically says that they've given up on getting women in the field to want to come to their conference, and the only way to get them there is to hire them. It's pretty lame.