How are these "No Bounce" plugins and tools a good idea?

There's been a few of these "No Bounce" type products come out recently.  In fact one of them has sold over 2000 units on JVZoo. But I have to ask why?

I mean how is it a good idea?

I don't mind exit pops but to hi-jack the back button and trap people on my site is a technique from ten years ago that dodgy sites used.

If you have a high bounce rate I would put it to you that you don't need a plugin to trap visitors where they don't want to be... Instead you need to make your web page more engaging and give people a reason to stick around.