Why is my Followers count always going up, then down? Even when I see new Followers, the count is lower today, than yesterday!This blog owner does not know about churn, and reciprocal Following.
You may Follow a maximum of 300 blogs - though your blog may be Followed by any number of blogs.
The asymmetrical limits, following to being followed, creates confusion.
The asymmetry caused by the limit means that some blogs, even with the owner Following similar blogs, won't get lots of Followers.
With blogs in communities which do a lot of "reciprocal" Following ("You Follow me, I'll Follow you!"), some people will see the Follow count limit, rather quickly. This is a common effect, with some communities.
People who Follow the maximum have to drop one blog, to Follow another.
When somebody who is Following your blog sees another blog that they really need to Follow, they have to drop 1 of the 300 currently being Followed. Your blog has a theoretical 1 / 300 chance of being the one that's dropped, with those blogs followed most recently being more visible in the Followers cloud - and more likely to be dropped.
The more people who Follow your blog, the more chance you will see your numbers go up and down. It's called "churn".
Publish, and Publicise, to keep your Followed count increasing steadily.
If you market your blog aggressively (and politely) - and if you publish informative, interesting, and unique content, regularly - you have a better chance of keeping the Followers count steady, or steadily increasing.
Right now, this is not a certainty, with Blogger Followers - since the Followers gadget is broken, and Followers surfing is not working. If possible, you should use Google+ Followers, to complement Blogger Followers.
Publish steadily, for best results.
Even with the gadget broken, though, you have a better chance of seeing the Followers count increase - or at least remain steady - if you publish steadily.