It's not necessary it's just to make sure it doesn't back out but your gun isn't going to break without it. I've never loctited my regs and have never noticed them taking huge swings while I'm not looking. It's just if you want to be 100% sure the thing doesn't ever move after you set it.
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I would purchase it simply because it will ensure that your lpr pressure stays put. It is not an immediate must have but it is worth purchasing. I also use blue loctite on the feedneck screw and the rear ram cap screw as extra precautions.
Blue LocTite is cheap for a small tube, just stop at the hardware store or Wal Mart and buy a small tube...It's got a ton of uses in paintball, it's not like your having to drop a couple hundred dollars on it.