This is because many people are writing blog posts, but only a few people cares about other people's blog posts.
Probably the author and curation reward percentage change in the HardFork 21 (HF21) from 75/25 to 50/50 will change that.
Maybe the HF21 will help decreasing the number of bloggers (and/or the number of content creators in general), and increase the number of curators and maybe the real, human interaction with it.
If this will happen, then HF21 will be good for the Steem blockchain.