Hit n runs are best when you have the bankroll for a tournament that your planing on buying into. Your roll is good and it covers the tournament that your going to buy in to. So shortly before tournament hour or less. You sit at cash table and attempt to win your buyin quickly. Over time though your going to be relying on lots of luck if you continue and will most likely not have the roll for the high variance your going to run into playing that fast and aggressive and trying to make something happen. The variance swings will be huge and people don't do it cause its not that profitable, you would be extremely good AND LUCKY to break even over time and thats if your roll was large enough to handle swings that its going to take on.