I have the feeling that poetry today is not written for the public at large, or even for a large educated group of readers, but for a small elite group of people - other poets. Poets send their work off to magazines that are published by poets that know them; the magazine publishers, who are also poets, send their works off to other magazines whose publishers know them. And so on. It's a circular thing. It boils down to "you publish my poems and I'll publish yours". Or "you scratch my back and I'll scratch yours."
Dana Gioia, the American poet wrote: "To regain poetry's readership one must begin by meeting William Carlos Williams's challenge to find 'what concerns many men' not simply what concerns poets."