My G+ Policy.
If you don't feel your time is worth dealing with comments on your posts, and have to lock down comments. Then I don't think you are sharing anything that's worth my time reading, so you are out of my circles.
I don't have to agree with what you have to say all the time, but at least be open to discussing it. If you aren't then go do your own blog somewhere. It's called social media, remove the social part and it's just media.