The cost to design or modify an ad is $30,000. You can modify the same ad multiple times in the same quarter and you will only be charged once. So if you create ad "A" in quarter 3 and then decide to modify ad "A" while still in quarter 3 you will only be charged once, but if you modify ad "A" once and ad "B" once you will be charged twice. If you enter the ad design screen and decide you do not want to design/modify the ad then use the cancel option so that you will not be charged.