1.They're fun, easy to build up, gives me better pedaling power on my mtb.
2. I'll admit, I was attracted by the aesthetic of the bikes. But once I rode a fixed gear bike in downtown traffic I absolutely fell in love.
3. I used to ride a ten speed myata as my commuter bike, then I gave it to my dad. I have a Giant XTC mountain bike that I absolutely love. I ride trails as often as I can. I used to ride BMX as a kid, but that didn't end really well. Haha. i only learned a couple of tricks but just used it as a means of transport.

Hopefully I'll get another 10 speed soon, not to convert.