The GPL: legit, but may contain malicious code
WooThemes's official Twitter account, in response to a request on whether a site giving away all their GPL'ed themes1 for a low fee is in breach of the license:
[I]t's legit, but we don't promote it as the themes are outdated & may contain malicious code.
So that's it, then: the GPL is great until someone copies your commercial work and openly resells it, at which point making subtly unfounded allegations is the best way to save face.
- I'm not linking to it out of respect for the work that actually went into building Woo's themes. For the record, I think that what has been done here is despicable, although it illustrates the weakness of the GPL model that the WPF wants everyone to adopt perfectly. a†©