I've noticed the WPMU Dev attribution links in the footer of many of the themes downloaded from the site. While I don't personally object to the links, I think it would be a great idea if you were to provide a plugin that would allow subscribers to automatically replace the attribution links with WPMU affiliate links or even remove them entirely. Ideally, WPMU Dev gets full credit for the theme and subscribers could get credit for referrals.
Obviously, subscribers could do this manually, but that's a lot of needless tinkering if it could be automated. The drawback from WPMU Dev's perspective is that a) it would certainly result in more non-subscribers removing the links and b) it would probably result in more affiliate payouts (assuming the footer links occasionally do result in sales). However, it seems equitable considering these are essentially premium themes that were purchased via subscription.
Thanks guys and keep up the great work!