Would you pay $5/yr for HN?
mattmcknight: It does work well for MetaFilter, but voting seems to work okay here. What exactly would you describe as "a lot of problems"?  What problems need to be solved?What if you could buy 5 whuffies (or whatever points on here are called) for $5, but could only post comments if your score remained above zero? Or maybe something in the stackoverflow type scheme, where the points are correlated with privileges?