Its a very asian thing. Very common among asian pros as well. The aim is not to give the illusion of middling every ball, it is to get rid of that "sting" up your bottom hand when you dont middle it. That sting is very very hard in GM bats due to the stiff handles. And this is exactly what my teammate did to his handle. And he's happy with the results. Though i will say it will most definitely increase the risk of split shoulders and broken handles exponentially. And you can say goodbye to any or all warranty