[dr42]

The cost has nothing to do with the product, that's determined based on other factors, like how many Mac's OSX sells. There's no straightforward relationship between price number of features.

The direction appears to be cheap upgrades, and merging feature sets between IOS and OSX so eventually there's one operating system that changes in unison.

[Zirro]

"The direction appears to be cheap upgrades, and merging feature sets between IOS and OSX so eventually there's one operating system that changes in unison."

It is believed by some that Apple will not be pushing their operating systems in this direction:

http://daringfireball.net/2012/02/mountain_lion

Specifically: "Mountain Lion is not a step towards a single OS that powers both the Mac and iPad, but rather another in a series of steps toward defining a set of shared concepts, styles, and principles between two fundamentally distinct OSes."