A very large factor in the WPA sanctioning process is that there is enough required added money that the players who have to travel have a good chance to break even. The later Dragon "WC"s had essentially no added money. The ones that were in NYC were not cheap to attend. Here are the added-money requirements for WPA sanctioned events:
Category 1 – World Championships, minimum 32 players and minimum added prize money is $100,000
Category 2 – Events with a minimum of 32 players and offering $75,000 or more in added prize money
Category 3 – Events with a minimum of 32 players and offering between $50,000 and $75,000 of added prize money
Category 4 – Events with a minimum of 32 players and offering between $25,000 and $50,000 of added prize money
Category 1 – World Championships, minimum 32 players and minimum added prize money is $100,000
Category 2 – Events with a minimum of 32 players and offering $75,000 or more in added prize money
Category 3 – Events with a minimum of 32 players and offering between $50,000 and $75,000 of added prize money
Category 4 – Events with a minimum of 32 players and offering between $25,000 and $50,000 of added prize money