That seems to me to be problems with individuals and not the conference. I've seen people go to conferences and basically skip out on half (or more) of the sessions to go drink and party, and I've seen other people stay locked in through the whole conference learning, taking notes, and participating.
For a company it may be hard to discern who is who, but I'd argue that somehow who squanders an opportunity and misuses company resources is not the person you want on your team.
But don't worry, I've never actually went to a tech conference, exactly because of the huge cost combined with not usually wanting to go to most talks. So I'm not going to be that guy on your team! :)
And because you're on a trip, there is less distraction from dog, family, costs.
That's already true for the vast majority of conferences out there, so it's easy to fill the year while ignoring the party-destination ones.