Paddlerpj,
 I had a "bad" experience backpacking in the Porcupine Mts back in the late 70's, it left an indelible mark.
Four of us came out of the park to find that vandals/thief's, had stole ALL our street clothes, tool box, cooler, cut radiator hose's, cut fan belt, cut battery cables and stole battery, and broke the front windshield.
No cell phones in that day, I hitched into nearest town, and found service station and had it towed in for repair.
It was my brothers BORROWED 4x4. Cost me $500, big money back then. WE made a police report, and the detective told us about a guy who they KNEW in a local village, fenced stolen property. WE made a little visit and recovered thee tool box and a few clothes, a story better left for another time ;)
From that day on, I've NEVER left a vehicle in back country, other than for day trips.

Jackfish,
 There's "local" politics involved in the OUTFITTER only idea. Sadly some AMERICANS do their part to fuel the idea. ALL of the illegal campers I've seen are from here. Unfortunately some people from the US "think" that the rules don't apply when their in a foreign country.
That attitude, plus some outfitters clients have had their vehicles vandalized/stolen property, gives rise to the idea that IF no-one parks there, the problem goes away?
 Tribal politics might be involved as well? I had one Native Ranger tell me that since many people don't check in at ranger station because they have their permits/licenses all ready, that "he" didn't know who was in legal or not? He said that they had caught people who came in with O paperwork and just thought they could get away with it?
 Politics/Control and Income issues, are all in play. Don't know if it will EVER happen, but morons, especially US grown ones, parking illegally won't help any that's for sure :( I figure one good fire from an illegal campfire there would probably get the ball rolling?