Thanks Prim.
That article explained it fairly well.
I know what you mean but you also have think about this:
1. You do not get updates or bug-fixes.
2. When your subscription runs out you don't have access to the Joomla-part of the forum
It makes complete sense what you say, so with that in mind, wouldn't it make sense to be able to "carry over" my site licenses when I change my subscription to the Wordpress Theme Club?