Let me ask you the most important question about Pop Up windows, ok?

We all know that pop up windows are effective in increasing opt-in email list(s), conversions and sales, right?

If that's the case, why do we have a zillion pop up blockers and why are pop up windows hated so much?

I'm asking this question because if we can know exactly why and we do something about it, we'd sure have a new powerful internet marketing tool that is more effective and powerful than pop up windows!

The answer in one word is... obtrusiveness.
Obtrusiveness is defined as «noticeable or prominent in an unwelcome or intrusive way.«

Sounds like a definition of pop up windows, doesn't it!

Pop up windows are hated because they are obtrusive and disturbing.