EXACTLY!!!! Ultra running attracts cheaters because as a courses gets longer it becomes easier to cheat. And the longer the race, and more beat down a person gets, the more tempted people are to cheat. It is also my experience from which I knew a group of runners who constantly BQed and ran Boston despite never really putting in the miles or having the speed. They all seemed to stop running marathons when timing mats came along and they moved to ultras. This was quite a few years ago, and is just my opinions but I feel strongly that they are obsessive cheaters. Can I prove it? No. But I had never seen one of them run a mile in under 8 minutes and they were running marathons in under 3:30.