Block discovery is a Poisson process: even a perfectly healthy pool oscillates above and below expectation. Luck of 130% over a day means nothing; persistent sub-90% luck over months can indicate problems (stale infrastructure, or in the worst case, dishonest accounting).
On PPLNS pools, luck passes directly into your income; on FPPS, the pool absorbs it. Before blaming a pool for low payouts, compare its long-run luck statistics and your own stale-share rate.
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