@Brimstone
I've also tried out polyamory. Twice, actually. The first time I was in a very bad place so I didn't care much, we both hooked up with other guys, no big deal. The second time, quite recent actually, I just couldn't do it, because this time I had actual feelings for this girl, but I didn't stop her from going on dates with other women, often times with women more mature than I am, and it made me feel inferior.
It was a lonely feeling, being with her, and knowing I wasn't enough (even though I did agree to an open relationship). We split 3 months ago, and now I don't think I can love anymore.
So you're right. It does take a certain type of people to pull that off.