The Stars FPP unregistering trick -- can someone explain?

[teddyFBI]

I've got around 7,000 fpps now, and I just read in another thread about some 'trick' that is apparently common knowledge/practice among Stars users that had to do with registering for a tournament with FPPs, but then unregistering and getting Stars tournament dollars that I can use for ANY Stars tournament.

Would someone mind explaining here how that works? What tournaments can I do that for? How many "tournament dollars" do I get back for, let's say, a 400 FPP entry fee tournament?