I'm pretty confused by this? I mean, we've all seen it happen (or had it happen to us). Of course, it's great to think "Wow, I look hot in this cosplay." And it's great when you know other people find you attractive, too.
What wouldn't be great, though, is if something like this were to happen. Like, "yes, I am a girl wearing a bikini/short skirt/tight outfit/whatever. And sure, that means I'm drawing some attention to myself. That doesn't give you permission to take sleezy pics of my chest. Do I run up to every hot shirtless guy at a con and take photos of only his abs? I don't think so."
Thankfully, I have never had anything like this happen.
What I read is that this happened within cosplay culture in Japan, where it's common for attractive models to be sponsored by the company producing the latest game/anime and dressed more provocatively. She's getting paid really well to be on display like this.
But seriously. So glad that even if there are a lot of female cosplays/characters that simply dress really provocatively, I'm really, really glad the the majority of cosplay culture in the US has managed to avoid this kind of forward sleaziness!