I also answer all calls I get and (usually) call back if they missed me. I actively gave my number to one or two research groups for polls. They call maybe twice per year, so it’s alright.
As for scammers, maybe 10% of calls are of that sort and so far I enjoy messing with them when they call.
Oh hey, can you try to explain why you want to do that? I’m always confused by it because unless you mean to end on a dramatic pause, these are just regular sentences and those usually end on a period (or nothing/smiley, if you’re an internet person