This is an interesting thread to say the very least. I really don't have much to add other than I have given it thought due to recently being told about a close friend's decision to give polamory a shot. And so far it's working for them.

Heck, I can't even find one relationship I am happy with, let alone multiples

I very much agree with gecko and Lilith though, what works for one person may not be the answer for another. It's just one more aspect of diversity that makes our world an interesting place to exist.