I think we should get rid of them. I know we won't. Sex appeal sells, it's as simple as that. Especially in a medium centred around teen boys. And, frankly, if the guys are desperate enough to think a picture of them with the hired girl is a good thing then we should just let them do it.
If I was coming back from a gaming convention with pictures of me with girls I met, I'd prefer the story behind them to be "look at this attractive gamer girl I met. We spoke for ages, took a picture and exchanged contact details. I made a hot friend!" rather than "look at this hot girl who was paid to stand next to me. I don't know her name and she seemed like she didn't know a thing about gaming. But look, I have my arm within 3 inches of her fake breasts!"
Sadly, the majority of teen men are driven entirely by hormones and their penis will swiftly guide them to the nearest attractive woman, even if she is only standing within 50 feet of them because of the money being waved at her.