PGA Tour is what works out the modalities for the tournaments played by professional golfers in the US. The members are essentially distinguished players in their fields and has some of the best athletes in the world.
To participate in a PGA tour, you must hold at least a tour card awarded by the professional organization. The cards are essentially awarded only to the top rankers in the game played in the last season.
The PGA Tour essentially doesn't manage an account of profits it made. Whatever money is made, is donated to charitable organization in the cities where the tours are held. It has managed to raise a lot of money, probably one billion dollars, in efforts to raise funds. Except for a few exception, all of the tours conducted by the PGA are non-profit.
There is the European PGA tour that operates the game of golf in the European continent, while the Australian PGA tour takes care of the game of golf in Australia. The American PGA tour and the European PGA tour are separate organizations, but both are responsible for the organization of the World Golf Championships.
The important point in being members of the PGA tour or the European PGA Tour is that you must know how to play golf like a professional. This is an elite club meant only for the top slot in the game. One is pushed to the edge of one’s potential to be a part of the game. A game of golf typically involves mental as well as physical fitness. Quite a few players have made it to the rankings of the athletes that are paid the best.