if you are content to only hunt what you have near your home, you don't need a guide or outfitter. if you want to hunt some other places, hiring a guide/outfitter may be the only practical way.
i can hunt in bc, alberta with a hunter host, as well as various states in the lower 48 US on my own. but outside of that, would need to go the guided/outfitted route. and someday i am sure that i will.
also, there is no substitute for experience, especially in wilderness areas. it is one thing to pile everything into your vehicle, camp at a forest service campground, and hunt. it is quite another to pack 20 miles into the bush with whatever you can carry on your back. let alone carry game out.
so, as riden said, don't be too quick to judge others.
brings to mind other debates. ie: hunting with dogs, baiting, crossbows vs regular bows, inline vs traditional muzzleloaders, etc.