@Andrea_R - None of us, to my knowledge, have missed the fact that the GPL does not preclude one from charging for GPLed code.

However, one very prominent person in the WP community - namely, the (ostensibly) benevolent dictator for life (to borrow a term coined by Mark Shuttleworth, the BDFL of Ubuntu) Matt, has a very clear agenda to discourage WP plugin developers from doing just that. It is patently obvious that Matt does not want developers charging for theme or plugin code.

The problem, of course, is that Matt is enforcing that position using a specious GPL argument.