In spite of all the people on these boards who have been preaching that AMD came in with their pricing too high, it's obvious they were wrong. We are seeing sales because they are competing. That is the whole story. There is no little side story about Apple, or nVidia wants to take the final 20%. They have competition from AMD, period. And as you started to say, it's nothing but a good thing for us. Some people still feel the need to defend nVidia though.
As far as AMD dropping prices, remember they still have another Fury card to release. There's also likely a couple other moves they will make with Fury before they resort to cutting prices. At least on any Fury cards. (I can see 390(X) getting price reductions soon.) This release has been far more strategic than is typical from AMD.