That was the question posed by a Radio 4 documentary broadcast yesterday, entitled 'Beanz Meanz Rhymz'... which included a brief contribution from me and Scowling A.D. (should be available here - our bit is at 25 mins in).
The presenter concluded there ARE similarities between copywriting and poetry, since both deploy a similar armoury of linguistic weapons, including rhyme, alliteration, rhythm, metaphor, simile and compression.
Most contributors agreed that these techniques help advertising messages penetrate the cranium and stay there. However, some of their examples ("You'll wonder where the yellow went when you brush your teeth with Pepsodent") were archaic.
So my contribution was to suggest that while you & I may remember tons of jingles and slogans from our childhood, the adults of tomorrow won't. What sticks in their heads is more likely to be the visual extravaganzas of Cog, Balls and Gorilla.
Or am I wrong?