I generally agree...unless you're a hardcore gamer.
This image says it all...
As games have gotten more complex, the need to memorize vast numbers of keyboard shortcuts has increased. Even games I play addictively, I tend to forget a shortcut on occasion, gets very annoying. This would surely help.
Of course, I don't game nearly enough to make it worh $200 (or $100, or $50...), but I could see where someone might want it.