Maskedbishop - even though you started this debate, it doesn't seem like you care much about anyone else's opinion on this topic since you seem rather content with just telling everyone that studying GM games don't help. Most people who study GM games aren't studying it properly or just browse through it like they would a brochure so they obviously won't get the benefit from it.
Studying GM games is probably one of the most important things a chess player can do because of the many reasons already presented here. I don't see a lot of point arguing with here on a chess forum so I'll just say this - most people are awful at chess, whether it's because they're old, not talented, not hard-working enough, not given enough opportunities, introduced to the game too late or a variety of reasons. Trying to extrapolate from a series of terrible absolutes (authors only use GM games, chesslife only uses GM games, everyone must study GM games) and using that as the crux of your "statistics" is not something you should strive for when trying to convince the masses of your statement.
<<There seems to be an assumption that if you stare at their play enough, and have someone "explain" it to you, eventually osmosis will kick in and your own much more limited set of chess skills will absorb theirs.
I say...NO. That doesn't happen.>>
It will happen if you're capable of learning.