Feedburner feed count fluctuations. Why?

You might have observed your Feed Count showing different digits with in short time. If it is higher than actual we won’t feel much, But all the time it will show only less count than the actual. Have you ever thought about it like why? How to avoid it?
I noticed it very frequently with TechZoomIn and did some research. So today I want to share those.
After observing it I asked Daniel of DBT about this, he told it’s expected and don’t need to worry. Not only he many people told the same, but I couldn’t find the reason and avoiding formulas.
Why?
Actually there are two types of subscribers included on that feed count. Those two are Email subscribers and Web based or Online subscribers. Email subscribers are people who requested to deliver your articles by mail service and Web based subscribers are those who subscribed through online services like Mybloglog, My yahoo and etc…
So here Feedburner will act depends on the mail subscribers active on opening your feeds and the online subscribers seeing there accounts. Here mainly the count variation depends on mail subscribers. Darren explained little more on this topic.
How to avoid?
We can’t avoid variation, but we need to work towards increasing the feed count. For this you need attract your mail subscribers to see you content daily. So that Feedburner will count all those readers on your feed count. Feed burner counting only the active mail subscribers that means simply ignoring the people who see your articles very rarely.
Did you ever observed this on your blog?

Source:TechZoomIn