Same here... Didn't really see the point.
Is it worth it?
I said before that I didn't use a mouse mat for many years about 4 - 5. Never thought I needed to at all, until I went playing cod4 at lans in competitions on some horribly grainy wood and broken pieces, a mat came in handy. Since then I have realised it is better because of the consistency of the surface. A desk might be ok for your day to day jobs but in games, it's serious business, remember the Quake 3 days when rail gun had to be bang on. Welcome to the Quake Live days where not a lot has changed
