Infomercials have a series of tricks which seem to trigger Pavlovian responses in many viewers.
The printed Infomercial is a good example. It is highly visual, just like the web. And every printed-page Informercial advertiser knows, there is about a 1.5 sec. Beyond that, the primary purpose of every sentence is to make sure enough value is conveyed to insure I read that next sentence. Graphics in this context are for the purpose of enhancing the message.