Sometimes I dont get the blockchain

In the etn pool, we just recently got a block. With only ~80kh/s at the time. If you do the math at 1440 blocks everyday and the network hash, it would require ~200kh/s to get a block. What I dont get is that Oliver nicehashed and we still didnt get a block. 

I know about luck and all of that, but sometimes the blockchain is weird