I'm not claiming this is true, only that it's how I think about it. All forms of public performance, including blogging, youtubing, singing, dancing, etc. are dominated by the Pareto principle (roughly 80% of consequences come from 20% of causes) and Sturgeon's Law (90% of everything is crap). Any success you see anyone having is solely due to survivorship bias. Unless you are already an amateur success, it's very unlikely you have the ability let alone the dedication to pay the price to be anything remotely close to a real success. It's always been this way. It's never been worth it to have a blog. That is, unless it's worth it to you. In that case go for it!