The same reason I got it from NN. For a clean nic, it is perfect. I guess I like my nic a little dirty though.
I've been using MFS nic for 3 years or so. I recently got a bottle of Nude Nic to try, just out of curiosity. The difference isn't drastic; but the NN is cleaner than the MFS. Both are good. The MFS just has a bit more 'bite' than the NN. Some people actually prefer the slight peppery taste.