Umm... That's..odd to say the least..
I understand if someones doing painting or blushing (especially working with a head) and they want to keep the job clean but regularly? Considering these dolls are so expensive I would guess that anyone that buys one does it because they love the hobby and want to enjoy the doll. And you've got to remember its not like they're made of flower petals
Yeah, they're going to get dirty, but that not something a little bath can't fix. Just a few days ago, I didn't notice that my liquid ink pen had burst and I had ink all over the outer side of my hand, and being unaware of it, I picked up my doll and got ink on her
....
But it washed right off. It was a dumb mistake but definitely not something that's goint to keep me from playing with her like usual.