Just an aside, but over the last week I have watched 2 credit videos while also watching the Democratic debates and other brain draining television to the tune of about 1000 credits. Any US based WGT players with mobile devices should not have to buy credits.
And interestingly, as I sit at my computer answering forum posts, I also have my iPhone open to WGT and am earning credits by playing the videos. People say that they don't have time to "watch" the videos but they do other things that use time that is perfect for doubling up.