I wonder if a "leaky bucket" analogy might be interesting, with a bucket size >1. Say, 5 posts a week, you can make 5 today and then another one once the bucket empties enough.

Or maybe a couple categories: Cat 1, limited to 1 a week, cat 2 limited to 1 a day, cat 3 limited to, I dunno, a few times a day. Or 1/month, 1/week, 1/day? Then when I subscribe to someone I can pick which level I want?

I, personally, tend to prefer more smaller things, as opposed to a big wall of text. But, I'm also willing to admit this just might not be for me.