So its not that you are bored when you are winning, rather you are afraid of messing up a good thing. That makes a lot more sense to me than the boredom statement. In an enviroment of unlimited opportunity, I think we all could do better than we are, so why not try and push it 

Quote from mahras2:
When I am winning I always tend not to fiddle with the models in fear that it will cause harm to the results in which case I will always blame myself. I know that everything can be improved which is why on any given week I will probably spend quite a few hours on development and research. Its just how I like to approach things.