I am not interested in booth babes. That being said, the only reason I might mind it is because videogame companies are simply wasting money (and since it's not a big waste of money, I don't mind it very much). If you don't stand out (and since almost everyone employ them, you don't stand out), then what's the advantage for the game? And honestly, I doubt anyone will be swayed into buying one game or the other by them, or even watch a trailer they are not already interested in, because if they like to look at the girls, they will LOOK AT THE GIRLS, they will actually pay less attention to the product.
I don't see any reasons to ban them, though, people could walk around naked everywhere, for all I care. Wanting to ban them is just something prudish people would ask for, or people that get offended about what a marketing department might think of them (I don't see why anyone would, marketing departments are dumb by definition), or people that believes that other people aren't as smart as them, and needs to be protected by the "booth-babes-mind-trick" or have some misguided idea about women being defined by what other women do for a living (some sell their bodies for sex, does this mean that all humans do? Some women dress up for money, does this mean all women do? Does this means that other human beings, not some alien creatures that know nothing of us, should come to the same conclusion?).
Not only I don't think there is anything wrong with earning money with your looks, if you find people willing to pay for it (I would be okay even with sex being sold, but in many countries it's illegal, and criminal organization get their hands on it, leading to horrible abuses, so I am not going to debate on this now) and they want to, I am totally fine with it (I might get mad if someone gets a job that requires a smart/capable person, by virtue of being beautiful/handsome, but otherwise, I see no problems).
Am I smart? I go to med school. Am I physically gifted? I do athletics. Am I beautiful? I do the model/booth babe/whatever.
I doubt booth babes ever hurt anyone just for being booth babes, so no need to ban them, this alone should be reason enough (hurt feelings don't count, of course).