Definitely not a stupid suggestion - I haven't contacted the police yet, no. I was stuck between contacting this person directly to give him a good scare (maybe he'd reconsider what he's doing) or contacting the police, or passing on the info directly to Netflix.

If it was me I'd contact both the police and Netflix. Let them give this person a good scare. Doing that yourself might have unintended consequences such as acts of violence against you or your property.

I am not sure Netflix would give a crap...

They'd want you to change your password to prevent it... but you're supplying them with a random name and address... pretty sure they aren't interested taking it on faith that that person is responsible and then attempting any intervention.

I would also be fearful of living in any city where Netflix theft is handled with any serious police resources.

Yeah, I would contact both. Netflix may not even call the police if the damage is "minimal" in their terms. Getting the police involved forces the issue with Netflix. I'm not sure how effective it will be, but it doesn't hurt. Or you could mess with his/her head. Hire some guys to follow him around for a few days and make it very obvious. Man, I can think of so many possibilities...