So What's in a Blog?

That is the question, do you know the answer?
I have read various blogs for a very long time, but it is only in the past month that I decided to dip my own toe in to the water and lay myself out there for all to see. I'm still not quite sure why I've done it.  I am a shy and very private person by nature.  So to put myself OUT THERE in such a public manner is quite alien to me. Maybe it's because I saw some beautiful blogs which inspired me and I hoped I could in turn inspire others.  I don't know.
I, like many of you, have my favorite blogs and each one I generally follow for a different reason.  Sometimes it's the photography which draws me, sometimes it's the content and the way it's worded, other times it's because I follow that blogger on youtube, but one thing I do know is I LOVE IT whenever bloglovin' lets me know one of my favourites has written a new post.
But why do some blogs appear to get such huge followings?  I'm not naming any names but you see some and the layout of their blog isn't the best, the grammer and content leaves a lot to be desired and they are just a bit eurgh, but still they appear to have some kind of cult following.  Is anyone with me on this one?  Likewise I see many blogs out there which have been going for a while and they really should have more followers because they are just fab.
Don't get me wrong I am in no way jealous of the big blogs, I am way too long in the tooth for that and I don't think I would feel comfortable with thousands of followers.  I am happy that anyone is interested in and is following my blog at all. I'm not even sure where this blog will go, it's still in its infancy.
So really the answer to the question that I am looking for is, what makes you follow certain blogs?  Is it because the blogger is a similar age to you? Is it because they appear to have a similar lifestyle and interests to you? Is it because they are big in the blogger/youtube world? or that blogger is someone you aspire to emulate?
I would love to know your thoughts.