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With a 25% turnover of events every year, Circuit events will be replaced by Non-Circuit events the following season, even if the WPPR points for those events aren't at the same level as the events exiting the Circuit.
That rule is specifically designed to not allow all the Circuit events to continue to benefit forever for always being "Circuit events".
There are and will be a variety of formats included on the SPC for next year. For those players not happy with the quality of specific events, they should show their displeasure by not attending and supporting those events.