They briefly changed the tiers earlier this year to gold, silver and bronze, but quickly junked that terminology. Now it's back to Blue Ribbon (Mosconi), Major and Ranking.MR has a few tiers of events. I read through them a couple years ago on their site.
Blue Ribbon
Major
Satellite (was called something else but I forgot now)
The tier is based on the total prize fund.
Doesn't matter much since each dollar of prize money equals a point. The winner of the Peri got as many points as the winner of Hanoi. Both winners got $40,000.