Pretty sure that’s not why “bloggers are dumb”, though if the cure for cancer could be found in pageview generation then yes it would be (maybe) a bad allocation of resources to cover stories that are only interesting to yourself.
Given the reins to the godhead blog CMS, I know I could only muster the stuff to write (ahem) report about Gay Obama.
And we all know how music journalists are heavily invested in optimal allocation of resources. Definitely only write about “Ricky Gervais 2012 Golden Globes Opening Monologue”, “Pe Lanza leva pedrada na cabeça em show! (Rio das”, and “Champion Spotlight - Sejuani, the Winter’s Wrath” or else you may become instantly irrelevant and/or a plague on humanity.
Which is it? Bloggers are doing themselves a disservice because the thing they’re writing about isn’t popular enough -or- they’re bloviating pageview grabbers because they jump on the meme train? Allow me to destroy your mind: some people were writing about her video before she even had video. That’s a heavily zen form of blogging.
My advice: write about what you want, do a good job, and try to make yourself happy.