Put simply, I don't think there should be any expectation, forced or otherwise, about voting and posting.
The way things are now:
If someone posts and comments, they are adding to the wealth of material and joining in the discussion. Excellent.
If someone posts but does not comment, they are adding to the wealth of material here, even if they do not join in the discussion. Great. I might learn something, use it in my own game, or be inspired.
If someone comments but does not post, they are adding to the discussion and enhancing the experience, even if they do not provide material of their own. Also great. They may still provide insight.
The Horde reads but does not post or comment. Still good, because others find worth in what we do.
I think it's a flawed question, as I don't think anyone has a right to say "this is the correct amount of subs/comments to have!"
The correct answer is: "The right amount, is however many comments or posts I have now."
This is a free, open to public website where people can recreationally come and submit their own content. However much content they choose to submit is entirely up to them. It is not a paid workforce who must create feedback and fresh ideas for everyone elses amusement. I feel it's unfair for anyone to think that just because they have posted a specific way, then others must and should be able to do so, as well.
The ONLY person as far as I am concerned, who has a right to say that there is a specific ideal ratio, is Strolen himself. Reason being: He owns, pays for and has built this site. He is providing a service for us at the cost of his own time and pocket, and if he thought that people should post at a certain ratio, he probably would have coded up some fancy thing which stops people from being able to post subs unless they've commented enough (please don't do that, btw Strolen :p)
Though I already have said I sometimes force myself into writing up comments when I don't feel like it, it's not a common thing for me to do.
I am here to have fun. If I am guilted into forcing out subs, comments and material because I don't feel i've met other peoples' expectations, I will stop having fun.
The day Strolen's Citadel stops being fun for me is the day I leave it.