First, let me say, thank you for the praise.
Oh no bother at all. And a good question is not an interruption. If we don't know, we ask. And so you have. So I shall attempt an answer, to the best of my ability.
1. If you post a poem here you can no longer publish it?
Perhaps Witt could assist me, or correct me, if am erroneous in my answering of this one. She is more knowledgeable about such things. But, it has been my experience so far, that most publishers only want to publish works previously deemed unpublished. Therefore, for many, posting on a public forum constitutes a published work and they will not accept it. I did get one of my haiku published, which, thereafter, as the rights revert to the author I could post here...so long as I acknowledged the periodical or website on which it was first released. It was an online anthology, so I simply posted the link. It (the link) should still be present in the Today section of Splash. I’ll P.M. you the link.
2. Have you thought about self-publishing?
I have discussed self publishing with other members here, and sadly, at this point, for me at least, it is cost prohibitive. But it is something I keep in the back of my mind. I can assure you, O Scaled One of Multi Hues, as you will be first in line (If ever it becomes possible for me to do so.) yours will be the first autographed copy. G.