I'm gonna have to disagree. If no value is provided, then the blog will slip into obscurity and the problem will solve itself. But meanwhile, the writer him-or-herself is benefiting just from writing.
When I first started my blog, the value it provided was close to absolute zero. Now I'm nearing 1k visitors a day, well past $1/day, and I've heard from people whose lives were radically changed by my writing.
The overarching theme in this thread could be summarized: "Only experts should be allowed to write." Problem is, writing is itself part of becoming an expert (hence, e.g., the doctoral dissertation in academia). Personally, I find a lot of "experts" to be jokes: political pundits with millions of viewers who are wrong time and again, old scientists whose deaths are eagerly anticipated by young scientists; governors of Alaska
Experts are who you go to if you want guaranteed mediocrity. Amateurs, on the other hand, are a mountain of dirt, but within that mountain there are gems and diamonds waiting to emerge.