I definitely think it's about what you write. It also depends on the people who read it and are will to share. I started with just sample shares at my blog, but then started writing more personal things and have a lot more readers. Praying for even more followers in the future at http://tigerstrypes.com
I think you have to write something that catches people's eye as well as their interest.
Definitely think it's about the quality of a post. A good blog post is what always pulls me in to read.
In my case it's not just the number of posts, but the actual promotion you do of those posts via all your social media channels.
Personally, I prefer content over quantity. The content is what gets me hooked, although the quantity matters too. Quantity means a person is engaged with their blog and audience. And then there is the promotion of your posts. I agree with Julia on that. I'm sure there are undiscovered gems out there by people who aren't the social media types.