Advertisers, why don't they treat us like grown-ups?

I took a class in advertising a long while back, and found that 'basic' advertising is directed toward a fourth grade (US primary school) level of comprehension. I don't think it's changed much from the ads I see

And the trouble is we all have that inner child (the fourth grader)...we have got to say no to our inner child sometimes...stop spoiling them.

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My Gallery is here -
http://www.pbase.com/madlights
Why so serious? :The Joker