Well, I apologize...maybe not greenboard. I haven't done that much research on greenboard.
I do know, however, that unless you put up plexiglas or plastic walls, then NOTHING is waterproof, not even cement board. And I don't know that many people who put up plastic panels on their studs.
And you're right...EVERYTHING fails eventually. Whether it's greenboard, cement board, fiberock, or whatever. So that point is irrelevent.
Have you ever seen cracked concrete driveways? Do you know what causes this? Yep, moisture absorption. Concrete and cement are porous.
THIS is fiberock...and the installation instructions clearly state that you can install tiles using adhesive directly on top of the board.
http://www.cgcinc.com/home.asp?nav=51&mkt=30&bc=2.51
It should be perfectly adequate for most applications.
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