New Zealand’s Dan Carter plays against Argentina in the IRB Rugby World Cup 2015 Pool C match at Wembley Stadium in London in this September 20, 2015 picture. Carter is as big as it gets in rugby union, the poster child of a sport played in more than 100 countries. But Carter would need to work for more than 24 years to earn what soccer’s Cristiano Ronaldo is paid a year – a sign of the yawning gap in the financial firepower of the two sports. To match RUGBY UNION-WORLD/MONEYREUTERS/Russell Cheyne/Files