Amen! Lockers are no more "cheating" than any mod on your stock rig. I don't know how it could be cheating since this isn't a competition and no one takes score? If they are, so are mud tires, larger tires, lift, airing down etc. I love my locker because it helps be do obstacles slower with less chance of screwing things up mechanically and body-wise. I don't have to air down for traction so much so I keep my clearance to further reduce damage. That's like getting a little more lift. Had a LSD before but the locker does a *much* better job.
I also agree that driver skill should not be substituted with mod's, but get where you are comfortable over all with your skill and your rig setup. At some point, the more mod's you have the fewer trails you will enjoy--they will just get too easy. If you roll over *everything* with no problem or effort, is it still fun? I don't really want a front locker for a long while. The trails I do now are just right with just the rear and still have a challenge. The front too would make them no fun. For now.
Bottom line: It's your rig and your money. Do what makes it more fun to YOU, not what makes me or the other guy enjoy it more--whether that means more mod's or fewer or how you use them.

Enjoy,