I've been shopping a book of poetry to every publisher I can think of and they all say they really like my work, but then they pass. What's wrong? Are they just being polite?
If they all say they like your poetry, then chances are they're not just being polite. It's probably good stuff.
So why are they passing? Because books of poetry are extremely difficult to sell.
Unless you've got a unique angle, you'd probably do better breaking up your collection and selling individual pieces to magazines.