Another reason this is dumb is that this is the kind of thing that Google doesn't much like. They don't want to index and rank content highly just for it to be

Another reason this is dumb is that this is the kind of thing that Google doesn't much like. They don't want to index and rank content highly just for it to be mostly inaccessible. I have no idea how much new traffic to Quora comes from organic search, but I have to imagine its not unsubstantial.