Ask YC: Payment as a method of quality retention?

Just wondering how many people would be willing to pay a small fee like $5 to have a YC News account. There's been a lot of talk going around about how to manage the influx of visitors to YC news, and after reading http://news.ycombinator.com/item?id=165621 it occurred to me that a small one-time payment might actually be conducive to maintaining post quality.