I'm pretty sure most of the time gamers do this, it's to give the mouse more area so they can lower their sensitivity for higher precision. You can image searc

I'm pretty sure most of the time gamers do this, it's to give the mouse more area so they can lower their sensitivity for higher precision. You can image search "csgo pro player" to get some idea, they're mostly positioned to be ready to flick their arm when they have to aim. Though I'll admit that I often turn my keyboard slightly when gaming despite not playing FPS, just for comfort.