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I can only speak for myself. The main reason is the lack of time. I don't see the point in playing more than two tournaments at the same time.
In general, the idea of premier leagues, RP tournaments, and other "best of" events doesn't inspire me. It's not really my style. I'm more interested in playing shorter, but memorable tournaments. And what do we have here? First, the same old format. Second, the same people. Let's say, hypothetically, I win a prize. Then what? Play in the league, in my own circle? I've already written about my attitude towards such RP-style tournaments. So, enough negativity, good luck to everyone, and have a good game.