Why is poetry not "mainstream"?

Why are sales of poetry books so small compared to novels?
Why is something that is so important to me, of no interest to a large majority of people?
Why does poetry have such a "bad press"?
Did Eliot and Pound destroy the widespread cultural enjoyment of poetry?
Has popular enjoyment of poetry moved into Rap, pop music and comic verse stand-up?
What about middle-brow poetry?
Why isn't there a market for poetry that lies somewhere between Eliot an Eninem on the one hand or Eliot and Hegley on the other?
Do the notable success stories like David Whyte show a way to a rebirth of interest?
Or are they just exceptions that prove the rule?