We've had some folks request to be paid out in Bitcoin. We're open to doing this once we have a handful more (or so) ask for it... the tricky thing is that you then have to play the exchange rate game and withdraw money from BuySellAds when it's "favorable" for you to do so, since the advertisers aren't actually paying you in Bitcoin.
Are there any plans for popular ad networks to payout in Bitcoin anytime soon?
Another solution would be to use affiliate programmes such as Privateinternetaccess but once again, it would generate a low CTR I would presume.