The only risk is you don't own the page. If that campaigns starts producing big numbers, that's an unacceptable variable. A better solution is build your own landing page and then make a blogspot blog linking to the page. (Gives you an incoming link which helps).
Okay, that seems correct. Rob can you please get in touch with me through MSN, like you said. Im looking at spending $400 a week in adwords. Maybe even in a day. Anyway i thought i owned the blogspot blog. But obviously its with google, so this does make sense i guess.