Malenac,
you said...
"I challenge anyone to put a melody to most of the lyrics on the boards"

Well gee... I have done that.
probably 30..40...maybe 50 over the past 6 years (maybe more..I haven't really counted lately LOL)
If you go to my soundclick page..you will find close to 20 of them. a couple of those made the cut on my CD...and one of those, it appears will be recorded on someone else's CD. I think that means that the original "poem" was indeed a lyric.
I have my style limitations...as do others. So some lyrics I look at sing to me..and the melody comes easily. Others are easier for other composers. And when I've listened to the finished songs...I've found them to be "real songs"

MOST of the lyrics on the boards? well maybe not... Some lyricists are better than others. (for certain composers, I would add) and some lyricists on the boards are still honing their craft. to be sure.
But to write off the entire lyric board as a poetry forum.... frankly that sparks of naivete

Oddly enough.... when I came to the forums...I was looking to concentrate solely on writing lyrics...and let someone else write music for me. I felt like my music was in a rut. But I have mostly done it the other way around. I have found that some lyrics here have sent my music to places MY lyrics would not have taken it.