They've started to allow users to place ads as their background...they could be the first service that figured out how to allow their users to make money before the actual company can!
They only lost out to fraud. Any company dealing with users and money experience this - look at PayPal.
AllAdvantage is a perfect example of why you can't allow client side services to be calculating things that really should be done server side. You could send a magical packet that would log all your hours for a month instantly.
