A thing I'm curious about and thought I'd just gather other people's opinions on is the vari - angle screens found on a select few Dslrs such as the 60/600/650 D
Question I have is why do camera manufactures such as canon reserve it for it's middle band of cameras. I understand why it's not included in the entry level cameras as it gives the more expensive models an "extra feature"
However why is it not found on the higher end, 1,5,6,7 D's

At first I thought it was a pretty gimmicky thing that I'd rarely use, however with time have found my self using it over and over.

In landscape shots, when I'm shooting at an awkward angle or in water from a low angle and don't want to kneel in it.

In Macro photography, once again when shooting from a very low angle making looking through the view finder difficult even when lying down or when shooting at a very low aperture with extension tubes making live view a necessity.

And although I don't do much video recording can see how useful it'd be especially for those with out a magnetic viewfinder eye piece.

So why is it not included on the higher end cameras, it's always optional can easily be left untouched and function as a normal LCD screen.
Maybe the answer is obvious, but I'd love to be informed.