I'd like to resurrect this thread and post my opinion.
Ok, i may be the exception in this case. I'm a gas mask fetishist. I have no doubt of that (You can tell from my "GasMask Dictionary" work).
In the old days i was just a fetishist, but today i'm a gas mask collector too. And don't worry, i know how to separate those two worlds.
I also hate those guys who take a rare model and modify them for fetish or steampunk purposes. My collector side cries about it. That's why i have only one mask modified for it. All the others are in stock condition.
And just if you are wondering, no i don't use all of them for fetish purposes.
Only few and selected modern models.
For those who have any questions, feel free to ask. I'd be glad to explain and/or demystify it.