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No GM has never seen the Grand Prix. (Plus, it is no longer a player's own analysis if the player uses a computer--many programs these days are GM-strength--to analyze a move, regardless of who suggested it.)

I agree with you that some people put too much emphasis on rating points, but for the most part, if 2 players (a GM and a non-GM) analyze an unfamiliar position for the same amount of time (with no computer assistance), I'll take the GM's analysis any day of the week.

 Before the grand prix was played regularly, many gm's hadn't seen it.  In fact I think it was a game of bobby fischer's in which he played the same structure as black that people started thinking about playing it as white.  So theoretically you could take someone that was familiar with fischer's game, started playing it as white, took lessons from gm's, all while it was relatively unknown.  Then you get another gm who has never heard of it, and you can get better analysis of it from the player who is weaker yet has spent much time learning about it than the gm that spent all of 30 seconds analyzing the positions.  

I'm not going to disagree that with the same amount of time a gm can give better quality analysis.  But I specifically said above that a person can put in more time and effort and get better analysis. 

Sure, I agree with your final statement. I was initially responding to the suggestion that a 1000 player can give better analysis than a 1900 player. I still disagree with this, but I think anyone can agree with your other statement. (A GM who is only given 30 seconds to evaluate a position doesn't have enough time to give insightful analysis.)

Strangely enough it seems that a 1000 player couldn't give analysis equal to a 1900 player, even after alot of effort put in , but a 1900 player could give analysis better than a 2900 player, who has put in very little effort. :) 

Then of course, there is the whole debate about who is a better teacher, who is better at explaining things, in which the most important thing is not your rating.