Slightly inaccurate article - I've been following the discussion to some extent, and it's not that ThemeForest developers/sellers are banned from attending Word

Slightly inaccurate article - I've been following the discussion to some extent, and it's not that ThemeForest developers/sellers are banned from attending WordCamps, it's that they're banned from presenting, volunteering, or sponsoring. Basically it's a GPL dispute - ThemeForest themes are not fully GPL (they GPL the PHP, but not CSS, etc.), and the WordPress.org folks are against that. I'm not going to get into whether they think that this stance is legally wrong or whether it's just that they don't want to offer a venue and what might be perceived by some as endorsement or official sanction, because I don't know and I'm not sure that everyone involved does either. I do think that (from what I've heard) the way the WordPress Foundation has approached it is a bit heavy-handed.