I mounted my bar ends inboard of my grips because I wasn't using them at all out on the ends. I also thought they were simply way too far apart. Inboard of the shifters, they are more like the hoods position on drop bars, especially since I have my bar ends leaned forward quite far. I love the bar ends in this position and use them probably 60% of the time over the actual grips.
I've actually been thinking of cutting my bars and grips down just a bit to make them a bit narrower. I can't move the controls inboard any farther on this bar, which is why I would have to cut the grips.
I need to take a newer, updated pic of how it is now, this one is rather old.