You will not get an email on every reply. You will get an email for the first reply until you return.

Example.

You reply and subscribe (or just subscribe) to "Joe's Thread".
Someone else replies, and you get an eBot for it, but you don't click on the link to visit the thread just yet.
Yet another person replies ... or three or four or five or six ... but since you haven't visited the thread yet, you get no more eBots.
You come back to the thread to read all the replies and your subscription is reset for you.
Someone else replies, and you get an eBot for it.

 

Thanks