I do, because I don't roll my dice out in the open. I've had the experience of having a player so unlucky with dice that even when he played flawlessly, his character was close to death if not already dead. Actually, make that two players.
First player rarely survived a game session if the dice were rolled out in the open. I got in the habit of "fudging" the dice rolls for him to try and put some balance back into the game. It didn't matter if it was Shadowrun, D&D, Rolemaster, Vampire, Werewolf, Battletech, Trinity, or CoC.
Second player had a 3rd level fighter go down to a normal kobold (1E) where the player had max hit points and an 18 con. No crits were being used, either. This wasn't the first time his dice cursed him.
Also, I'm more interested in my players focusing on the story I'm unfolding than on my magical green 20-sider of death.