From your guys experience, when do you shut off a keyword/URL? When its past the value of the lead? 2x the value 3x? For example if I'm promoting a $4/lead offer and target siteoffer1.com has alread gone through $4 worth of clicks do you shut it off? Wait for $8? I know the law of averages states you should let it run, but when is it time to stop spending on a dead horse? Thanks in advance for your insights..