Blizzard knew this would happen when they lowered the droprates of good items to compensate for the existance of the AH. So is it the player's fault? I don't think so.
---------- Post added 2013-05-17 at 10:29 AM ----------
That's because Hell difficulty was the last difficulty, there was no Inferno. I got through it just fine without mods.
Defeating Baal without trading wasn't such a big deal. Defeating the Diablo Clone? Not such a big deal. Defeating Uber Tristram? Yeah, you probably needed to trade for that.
---------- Post added 2013-05-17 at 10:32 AM ----------
Maybe the AH should be about buying and selling 'good' items. While the 'really good' or 'amazing' items should be excluded from the AH? That way you can use the AH as a sort of stepping stone to boost your character if you want to, but the truly good items can only be found by playing the game. It would surely enhance replayability.