I don't feel like this is an issue? There's nothing fetish cosplayers can do that will cheapen the value of my own work, my own costumes, my own photos. You guys are all basing this on other people's perceptions of your costumes but really has someone else's perception ever really mattered that much.
If they're finding a way to degrade YOUR work, then that's because you let them. Yeah cosplay is often fetishized but pretty much all forms of costuming has a side of it that deals with this. I made my costumes for me. And it can't be made to mean any less to me unless I let it.