Here the TL;DR is the following: because the popularity of your blogposts will follow a power law distribution (in which you believe), if you want to be popular you just need to put out more content instead of trying to improve the quality.

An analogy: the popularity of painters follow a power law (or say we believe it). So to be popular, you don't need to be good, but to put out more paintings. Then if you look at the most popular artists, they shouldn't be the most talented, but the most prolific...

And then there are the arguments against the "power law everywhere" meme, that can be found in Mitzenmacher for example.