Most of the interesting content I read is produced by amateurs. Amateur writers, that is. They're professionals in whatever domain they happen to be writing about - food blogs written by chefs, programming blogs written by software engineers, startup blogs written by VCs & entrepreneurs, hardware blogs written by electrical engineers, gaming screencasts produced by gamers, political blogs written by political science professors.

I think that what the Internet revealed is that being able to write well takes a back seat to knowing information worth writing about. Content over form, in other words. In the old days, you needed dedicated reporters who would go ask the actual experts their opinions on events because most people could not hold down two jobs, and an industrial company is not going to also operate a printing press. Now, with the ease & reach of publishing becoming so much greater, it becomes much easier to publish on your nights and weekends, as a way of getting your name out in the field. I actually view mainstream media as "low quality" now, because when you compare any piece with the blog of the experts actually quoted in it, you see just how many omissions and distortions appear in it.