I wonder why someone down-voted this. I believe this is a great piece of advice. At events, I frequently get stuck talking to people who aren't beneficial to me

I wonder why someone down-voted this. I believe this is a great piece of advice. At events, I frequently get stuck talking to people who aren't beneficial to me (and I'm not beneficial to them), and loose opportunities with others. I typically just say "Hey, well it was great talking with you..." and it ends naturally.