I think you all are missing the point of a Beta program. Problems do occur, and you take on a risk by signing up for such programs. It's your every right to remove their ad codes, but I don't see why people are shocked that there are errors in the development process.
I blame companies like google and their GMAIL service, which while clearly done with beta development, still remains in the "beta" stages by choice. It fools people into thinking that next-to-no errors occur in beta stages, and that its business as usual.
It's not. You took a risk in signing up, live with it as hard as it may be.