Marketing is so rarely for a "novel" thing. The biggest spender is CocaCola, how much do we still need to know about them?
Its also so very rarely factual - the idea is more for you to believe that 'Disney Land is an important milestone for all happy families'. Or 'Stella Artois is the type of beer a sexy intellectual orders - that's you right?'
I completely believe that ads are a huge part of our culture.
Volume of ads I see is proportional to dollar amount imo. Outside of movie trailers I don't think I've ever seen an ad and been happy to know about whatever it was.