That would be funny if they did start charging... well.. ironic actually. Maybe they're jealous that people are monetizing off their site (but honestly, there are lots of ugly designs uploaded, it's getting out of hand lol)
It's because google no longer want people to sell links on sites. If you own a PR5 site -- and sell a link to a PR1. You make the PR1 look better to googlebot. Google dont like the way people are tricking their PageRank methord, so have told people to stop selling and buying links. Google are taking the piiss out of: Wordpress theme designers, sites like textlink ads, and just webmasters who can make a few $$ selling links. wordpress are one of the few listening to google, trying to stop ads being sold, messing up the PR -- shoemoney mentiones somthing on his blog as to why WP are listening, but i cannot remember what he said. I think everyone else is just ignoring google Read more here: http://forums.digitalpoint.com/showthread.php?t=356592
Ah yes I wasn't serious when I stated that. However, that's a very good point. In fact, many of us in the BST section are going against Google's rule eh?