I just found out my buddy started playing guitar. He's a lefty, and I asked him if he bought a left-handed guitar or if he restrung it and played upside-down. He said he plays it like a right handed person would though. Is this fairly common? He brought up a good point that fretting is more manually intensive than strumming, so shouldn't his dominate hand do the fretting. I guess if it works out for him, all the better. What do you guys think of this?