Why did the PDGA create this rating system?

Dealing with ‘sandbagging’ – players entering a division below their skill level – used to be a challenge. Since 2002, PDGA Player Ratings have been used to group amateur players in competition divisions to prevent players from entering divisions below their rating. In addition, ratings provide one element for ranking the world's top players on the PDGA Tour. Course ratings pave the way for statistical comparisons of courses around the world with the potential to help improve their designs and levels of challenge. Ratings also allow players to handicap their play against anyone all over the world. And based on member surveys, ratings are popular and fun to watch, not only yours but everyone else’s, too.