I have recently come across and purchased the Tasker app.
The app does is very different from any app I have ever seen in many aspects. One of the unique options that I have noticed in this app is that we can customize the notification bar icon of the app:

This screenshot shows a few of the many options available.
In the screenshot, one can notice that we even have the option to use the "Missed Call", "Bluetooth", "File Downloaded/Received", "File sent via Bluetooth" icons.
I am sure must be to enable users to disguise the Tasker app, so that onlookers do not know that the app is installed just by having a chance to glance at the notification bar for a moment.
My Question is: Why? What is the need? Can anyone give me a kind of situation in which a real person would need to keep his use of an app like Tasker to be a secret?
Edit: Here are the screenshots which show that it is actually used to disguise:
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