Yes, thats true ! When you play roulette and see a table with 20 times red, bett all you got on black ! For sure it will come.
Srsly: If a pool got 10000k miners he is still able to get 100000 blocks with under 10k coins in it. Its a lotto-roulette-gambling coin we talk about here.
Its unusual but possible. So go away with your 2 hours testing time... thats nothing.
Easy to spot scam pools because you end up with 25% of what you should get, even after 1-2 hours. I know that luck plays a factor but that's not the case in pools with enough miners. I have been using without any issue and auto payouts always get sent in a timely manner.