Good post, if a little cynical and knee-jerk. There's a massive difference with something becoming a viral sensation that implants into our daily life compared to something that's bashed on a website, and running beside all that, it's not exactly equivocal that their messages are being taken effectively.
When it comes down to it, there's a model called 'recency theory', which does what is says on the tin. There's also a model called the '3+ exposure model', which coupled together, reliant on the speculative potential consumer or not - the brand is a concious being, known to its audience. It may work, it may not, that is the risk advertisers take. It is a gamble, you can only try and reduce that gamble.