March 25th, 2010 - 10:17 GMT Ritchie Bros. co-founder to sell 220-ft luxury megayacht in Ritchie Bros. unreserved auction in Grand Cayman GRAND CAYMAN, Cayman Islands, March 25 /CNW/ - Next week, Dave Ritchie, co-founder of Vancouver, Canada-based Ritchie Bros. Auctioneers (NYSE and TSX: Read more