Manipulation via stack sizes

Hey All,
I just read in another thread that sometimes as a large stack, it's wise to keep the medium stack around when around the bubble.
It makes sense to me that threre's something good about this idea, but it's not clear in my mind why.
I think it's because you can siphon money off the medium stack because he tightens up, because he's waiting for a small stack to bust out. Is this correct?

Also, are there other situations like this that I can take advantage of?
I think I'm on the cusp of entering into intermediate play. [img]/images/graemlins/laugh.gif[/img] Yey [img]/images/graemlins/laugh.gif[/img]

Shooby