Just because the coin landed on tails four times in a row doesn't mean that going to someone else's coin-flip game is going to get you any more wins in the future. You could make the argument that maybe my coin or dice aren't perfect and favor one side, but bitcoin has perfect dice.
I don't think you understand why pool hopping really is profitable over the long term as
compared to switching roulette tables or slot machines and why gamblers fallacy doesn't apply to block finding probability.
Proportional pool luck is determined by current difficulty factor and hash rate.
There is a certain statistical point at which blocks will be *usually* found given a large enough statistical sample (100, 1000 or more blocks)
A gambler can't *expect* to get a certain amount of heads or tails in a coin flip because the statistical probability
of either one is always 50% (assuming it can't fall on it's side) over the long term.
A miner can expect 95% of blocks to be solved in the long term at 1.56m difficulty and roughly 9½ hours spent at 600ghash/s.
If the occurrence of rounds surpassing 9½ hours becomes significantly more than 5% in the long term (let's say 20%), the miner can expect foul play.
Just as if a coin would consistently fall on the tails side over 1 million throws (let's say to a 70:30 ratio), you could suspect the casino has a weighted/rigged coin.
3-8% would probably pass as variance