It's worth noting those Skybet odds are from their "RequestABet" market, ie readers request odds on a specific bet. That list contains what might be one of the worst-value bets you'll find, Hull KR quoted at just 20-1 to win every game by at least ten points.
Leigh spent fortunes prior to last season, and absolutely dominated the Championship as a result, but as well as losing to Batley and drawing with Bradford there were ten other games where they failed to win by 10pts or more.