Expensive relative to what? Certainly not expensive relative to the rest of your computer and your office chair. It's a great shame that so many of us are willing to put up with the ten dollar keyboards that come complimentary with desktop machines. The keyboard is the primary input device used for many hours every working day. We deserve better.
It would cost me half my monthly salary, if I didn't get taxed. For something that I might not even get used to and have no one to sell it to in the local market.
