I think it has to do with the echo chamber effect that reddit has. A couple months before Obama was reelected, there was a front page post saying (approximate - from memory), "Based on reddit, there is no way that Obama could not win. But he's close in the polls and a lot of people are still saying Romney has a chance. ??"

You see the same shenanigans happening in /r/politics and /r/atheism. If you put a bunch of likeminded folks in the same room, you get likeminded answers that don't accurately reflect reality. There are a lot of early adopters on /r/bitcoin and there are a lot of believers. But, in order to have a productive and accurate conversation, you need to have a varied set of opinions. Reddit's overall demographics have diversified from 6-7 years ago (when it was almost exclusively programmers) but it is still a bunch of younger, mostly male, technology literate folks. I would guess those demographics are only intensified in /r/bitcoin.