"There are more bets on the Browns to win AFC North than the other three teams combined. Only the Raiders and Steelers have more bets to win the AFC. The public likes the Browns, and I'm not sure why."
Caesars Palace sportsbook manager
http://www.espn.com/chalk/story/_/id/24434899/cleveland-browns-attracting-high-number-bets-las-vegas
Also,
At MGM sportsbooks, the Browns have attracted more bets to win the Super Bowl than the Atlanta Falcons, Kansas City Chiefs and Jacksonville Jaguars, who were playoff teams last season. Cleveland is listed at 60-1 to win the Super Bowl at MGM.