Interstitials ads are not the same thing as whiteboard ads. Like I said you just don't wake up one day and put them up within 24-48 hours.<p>Your theory is still a crackpot theory even if someone from TC didn't point it out. I doubt you have any IRL experience in selling online ad inventory.<p>Yes almost _all_ popular adservers allow interstitials, doesn't mean you see them all the time. Why? Because high paying inventory are only available in certain time of the year. Including, high-profile product launch and holiday shopping season.