Consider that last season the Cleveland Browns made 65 punts for 2,950 total yards, that's a lot of real estate. Thus, making yards with returns and holding the opposition are vitally important, and very interesting to study since special teams plays (punts, kickoffs, field goals) are so different from "normal football."
Perhaps Browns fans have been spoiled by years of watching the likes of Josh Cribbs, Cube McNeil, Eric Metcalf, Greg Pruitt, and Leroy Kelly. It seems natural to us that the Browns score on punt returns, and the opposition does not.