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It's an interesting question. When I follow a hub, I survey their entries before deciding. It's not personal. Just because I don't follow a hub doesn't mean I don't like the user or that his a bad poster or even that we can't have meaningful conversation on the comments sections. Since the liking has been substituted by the 'hubing', I've been more watchful of where I click: I want my hub to have some kind of unity, of consistency. Even if I don't hub the post, doesn't mean I won't gladly join the discussion.
So number limit or not? A personal limit is good. I constantly reviewed the people I followed on Twitter, trying to get the number down to the most consistently interesting users. However, a number limit might create the same awareness of quality that it did in the liking/hubing situtation.