There's a bit to remember in here too - age. WOTC's market research showed that after about 35, buying goes down. Really down. To the point that they actually stopped looking at anyone over the age of 35 when they started doing market research for 3e.
Look at the age on this board. There's a whole lot of us in the 30+ crowd. It's been shown that at this age, we stop buying.
So, why would you design a game for me?
We're quite possibly not terribly representative because we're just outright older on average than most gamers. I know the last Paizo poll I saw for Dragon pegged Dragon readership average age at early 20's. The average age on this board is about ten years older than that.
Which is more representative of gamers? I have no idea.
Interesting. In my gaming group, 3 of us are over 35 (the other three are late 20's). One of them plays 4E (and has bought several books) and the other feels that he dislikes the WotC treadmill.
Myself, I have bought the 4E PHB I&II, MM, DMG, the 3 power splat books, one FR book and open grave. I also bought the Pathfinder core rules and the Golarion campaign setting. So I guess I voted for both systems.
Both have features that I really like. I think Pathfinder was (to my great surprise) well done. I like a lot of the 4E mechnanics although it's no longer like the AD&D of my youth. I still have 1st and 2nd edition with a strong bias to trying them again someday.
But all of the games under discussion seem to be really good systems to me. Not to everyone's taste in all cases but there is a reason that they have partisans. Unlike other systems that I have bought and have languished in (deserved) obsurcity.