As ERK points out, unless one is hunting it's OK to wander around in the wilderness at will. So, any argument a guide is needed to cut down on the costs of rescuing lost hunters goes out the window. Hikers don't need a guide and they get lost frequently. Some even die before being located. Do berry pickers, birders, botanists, etc need a guide? Fishermen/women? Why only hunters????
Because hikers and birdwatchers ain't gonna pay big bucks for a guide.
