Every story has (at least) two sides, doesn't it? Here's an essay by Charles Bernstein, published in 1999 called "Against National Poetry Month As Such." He argues that it promotes bland poetry.
Personally, I think he's overreacting. Even if you accept that National Poetry Month doesn't effectively support poetry, the idea that it actively hurts the genre is a stretch. In this essay, I think National Poetry Month is just a starting point for Bernstein, an excuse to criticize poetry that he doesn't like. What do you think?