Couldn't you have waited for more signups before triggering the alert? Surely if you said 75,000 were needed, then 43,000 (57%) was well short of the best number.
Or you should have called it "Get Hasselhoff into the top 10". It's all about managing expectations. This had the potential to be a rocket campaign, but only if he really reached number 1.
The song will drop out next week cos it's only us lot who bought it. A respectable result, but not the one all of us who bought the single as instructed were after.