Why waste good ideas on advertising?
 (Bringing down the focus from the earlier thought process.)   (Addressed to advertising guys)     Bee Orchid - XKCD   I. Agent to parasites    Orchids fool bees into carrying their pollen by making the bee think that it is getting laid.  Advertising works in a somewhat similar fashion.  The difference is; instead of genes, it is in the business of propagating memes*.   Advertisers needs agencies because, intrinsically, most commercial  memes are not interesting enough. Deep down in our hearts and colons, we  don't care about soaps and cars. we care about love and health and sex  and our sense of self and so on. (just read Vonnegut's Breakfast of  Champions. hence the hangover of 'and so on'.)  So the parasitic  commercial memes piggy back on emotional/ funny memes we really care  about. Agencies in that sense are the piggie-safari-wallahs. Agencies  help the fat advertiser climb onto the pig of ideas. (pig of ideas..  that doesn't make any sense. anyways.)     II. ...