Mining luck is completely random.
When something is random there will be runs of the same sometimes - that is just how randomness is. If you couldn't have runs of the same luck, then it wouldn't be random, would it?
You can't predict tomorrow's luck based on today's luck. That is gambler's fallacy:
https://en.wikipedia.org/wiki/Gambler%27s_fallacyBut over time the randomness evens out. See the law of large numbers:
https://en.wikipedia.org/wiki/Law_of_large_numbersThat said, some miners believe they can predict completely random events in the future. We have had such people try to pool hop Bitminter. When you come and go in a pool that is safe from pool hopping, it is completely random whether you get good or bad results. Of course if they got good results then they took that as evidence that they could indeed predict the future. No. If you play roulette, put your money on black and win, that doesn't mean you have magical powers. You were just lucky.
So there will be people coming back to the pool after the next block is found, thinking they are able to predict that "the luck must turn now". And maybe they will get lucky. But that doesn't mean they are people with magical abilities who are abusing the pool. It just means they were lucky. The thing is, with our reward system, when you do some work there is no way to know how well that work will be paid until later. Also, all work is treated the same, whether you are a 24/7 miner or part-time miner. So the reality is that they were just helping to search for a block, and their work is paid the same way as everyone else's.