Former referee from two Rugby World Cup's now worth £41.8m

Net worths of the richest Rugby Players have been calculated and taken from https://www.celebritynetworth.com/

Despite his early exit from Toronto, the two-time Rugby World Cup winner still finds himself on the list.

Starring in multiple sports; rugby league, rugby union and boxing, Williams has been in demand and has made good money down the years from numerous huge contracts.

Married into the money.  His wife, Zara Anne Elizabeth Phillips, is
the second-eldest grandchild of Queen Elizabeth II of the United Kingdom and Prince Philip, Duke of Edinburgh.

England's 2003 World Cup hero Wilkinson has a net worth of £16 million as of May 2014, according to the Sunday Times UK Rich List. He was utterly dedicated to his sport and remains a clean-living individual who has never attracted bad press. 

Gammell is a businessman and former Scottish International rugby player. A tall winger, he earned five caps, before following his father into business.

He has over 35 years’ experience in the international oil and gas industry and was awarded a knighthood in 2006 for services to industry in Scotland. Sir Bill, who is an ex-Scotland rugby internationalist (1977-1980) is Chairman of the Winning Scotland Foundation and Chairman of Genius Gluten Free. He was also an Independent Director of Glasgow 2014 Limited and a member of the British Olympic Advisory Board.

In 2006 he founded Winning Scotland Foundation to mobilise efforts to raise aspirations and self-belief amongst young people in Scotland. The Foundation's vision is ‘to help all young people in Scotland achieve their personal best’ and over £7 million has been invested to date.

Retired Irish rugby player Simon McDowell and his family were reported to have a net worth of $54 million in May 2012, as stated in the Sunday Times Rich List.

McDowell, now 43 years old, was an enthusiastic rugby player until an injury forced him to retire in 1990. He played for North Ireland Football Club from 1987 to 1990 before transitioning to refereeing. McDowell made his refereeing debut in 2002 and had the honor of officiating matches at the 2007 and 2011 World Cups.

To maintain his fitness for on-field duties, McDowell dedicates approximately 1,000 hours per year. In addition to his involvement in rugby, he is also involved in running the Kilwaughter Chemical Company.

The company's origins trace back to 1939 when it started as a quarry and mineral processor. In 1989, it expanded its operations to include mixing rendering products for concrete. Located in Co Antrim, the company is owned by the McDowell family and achieved a profit of £4.1 million from £18.1 million in sales.