Purple People Pleaser

Regarding this: "Only PDGA-rated players will be allowed to register in the purple or green divisions. Unrated players may register in the blue division" I registered in the blue division because it ... show more ›

Regarding this:
"Only PDGA-rated players will be allowed to register in the purple or green divisions. Unrated players may register in the blue division"
I registered in the blue division because it appears thats the highest division comparable to MA1 or MA2, but they quoted info pasted above from the about page makes it sound like I'm wrong. Why would unrated players only be eligible for the highest division? Did i select the right one if I'm 918 rated?