I think the scam calls are annoying, but it takes basically no effort to ignore them when I’m not in the mood to mess with them, so I don’t mind them so much.
I figure though if I can keep one tied up talking to me for a few minutes that’s one less chance for them to be scamming someone’s grandmother. It’s a tiny drop in the ocean, but it’s still potentially one less person getting scammed that day, and that’s worth something.