I don't rotate, because I get 2x the life out of a front compared to a rear. I get right about 3,000 miles out of my Maxxis in the rear. By that point, the front is just starting to flatten out in the center of the carcass. If I were to switch it to the rear, it would be dead within 1,000 miles, while the brand new front would have a good 5,000 left in it (give or take.) The vicious cycle of rotating would go on forever. So I replace one rear at ~3k, then both tires at ~6k. While it might work out the same in the end, I feel like replacement + rotation would just have me constantly buying new tires, and having to keep a detailed log telling me when to move what tire where.