The principle “the more creatives you utilize, the better” works really nice with push traffic. Multiple creatives help to make a/b testing and select what the viewers likes. But even if you’ve chosen creatives that perform rather well, it’s necessary to vary these variations in order that users don’t get tired of them. It works like on TV here: for the 1st time you watch ads with attention but then you know what happens next and focus less on it. Taking into consideration the indisputable fact that some users need greater than 1 spot for the conversion it’s low in cost to change creatives.