Actually, I'm in a serious poly relationship and my guy is dating another girl. I guess there's no end goal per say but getting to know another person and dating them for a bit knowing that it's not going to lead to marriage and kids is ok. Not ham sympathy, just defending polyamory.  As for hams, probably trying to keep the illusion that hot guys want them? Oh yeah, I get tons of offers (lies) but none of them are hot enough for meee!!