as ive personally seen, "Booth Babes" are ubuquitous at other trade shows as well. The north american international auto show for example employs a few hundred. the great american motorcycle show quite a few more. Cigar afficionado has a show in Las Vegas that has "babes" behind silhouettes and in front of customers. the reason? Sex sells.
A censorship policy prohibiting women who are not fully clothed to your standard is probably what youre asking for as it applies to both booth bunnies and scantilly clad cosplayers alike. The real question that needs to be asked is what constitutes a moral dress code, and should we enforce it when children are present at conventions? we certainly do not enforce the dress code at the local public swimming pool, and the beach is likely just as offensive.
sorry if this comes off a bit rough, im an LA native, but how did you make it into Los Angeles in one piece let alone the Staples Center? the billboards have sexy women, the strip clubs advertise them outside the venues, the homeless are prone to fits of total nudity and your average male or female angelino on flower street can show up in anything from a 3 piece suit to a pair of mens daisy dukes and a cutoff.