I don’t like the idea of polyamory. It feels wrong to me. But when it’s consenting adults (or parties of mutual age in teens), there’s no argument against it.
That’s a big problem with people: not being able to reconcile their feelings with rationality. My feelings are irrelevant to how other people conduct their lives when it doesn’t affect anyone else. I think that’s a key component in having an open mind: to challenge your own feelings, to say, “I don’t like it, and that feeling is objectively wrong. I need to actively check my behavior so I don’t impose that feeling on others.”
It’s fine to have those feelings and good to acknowledge them, but you still have to think it all the way through.
I think it could be dangerous given the limited scientific literacy of the general public.
I can imagine a slew of issues where people treat it like fat/calories and assume lower is “better”, or where other people think it’s like a vitamin and high is “better”.
I think 95% of people wouldn’t look, but that last 5% would be a mix of people that use it to their benefit as you suggest and people that misuse it as I cynically assume.