Does a 240hz monitor really increase skill?

As has been said before, the difference between 144hz and 240hz is minimal. You pretty much lose a lot of color quality and resolution when you go for a 240hz monitor, it will look dull in comparison to other monitors; however, it will be extremely smooth. If you value having a responsive screen more than anything else, then I suggest going for 240hz. If you care about how a display looks and you still want smooth game-play, go for a 140hz high quality monitor.