Allowing other people to catch up.
This mistake cost me a major tourney on Sunday.
I was probably triple the average stack and on my way to probably my biggest live cash when I got pocket 8's, I raised, there was a call then an all in, the all in was 2000 more chips, which I called so did the 3rd person.
The flop came qq8
and instead of moving all in on the flop, I checked hoping to extract a bet from the other caller who checked behind me, turn was a 10, I then bet out got raised, I reraised all in and he flipped pocket 10's
lesson learnt, when you have the best hand, protect it