[Quoth]

The Publisher notion of it is nuts. Partially bogus. Some purely "adult" stuff is billed as YA purely because it's Fantasy.

I don't mean "adult" in terms sex shops etc, just books obviously not written for teenagers. I think YA to publishers means 9 to 17 yo. School kids.

There is nothing anyone can do about this madness. Nor about Publishers wanting to pigeon hole everything. That's why the BIG 6 are seeing dropping sales on eBooks and indie ebooks have about 20% + growth.
The majority of sales in physical paper are either mass market established authors or illustrated / picture / graphic.
Look what is in Supermarkets.

The Big 6 include audiobooks (which are doing well for them) in their "electronic" sales, so their share of ebooks is worse than figures suggest, because there are almost no official ebook figures other than Smashwords sales. Amazon has maybe 90% and they won't say.