Commercial use of Experimental aircraft is not legal. The way many guides and many lodges operate in Alaska is that they sell you a "Package Hunt". That includes the guide fees, food in camp, camp accommodations, and oftentimes, transportation to and from the camp. In those cases, the transportation to and from the camp (and during the hunt) is generally considered "incidental" to the purpose of the hunt. The hunter is purchasing a hunt, not a flight. The flight is incidental to the hunt.
Look at aerial photography. Same rule applies. The FAA says that the use of the aircraft is incidental to the primary activity, which is taking pictures. So, no commercial certificate is required of the pilot, no FAA operating certificate is required, and as far as I know, there's no restriction on using an Experimental category aircraft.
Ten or twelve years ago, the FAA decided that they needed to require all guides and lodges to hold an FAA Operating Certificate (essentially a 135 certificate). They held a couple public meetings on the subject. Their stated reason for wanting to change this policy was to "improve the safety and accident record of the guiding industry in Alaska". At the meeting I attended, about the third gent who stood up to make a verbal comment asked the question: "If your purpose is to improve the aviation safety and reduce aviation accidents involving the Alaska guiding industry, why are you proposing to place us under the same rules as the Alaska air taxi operators, who happen to have a far worse accident record than we do, and who in fact have one of the worst accident records in all of aviation?". That kinda ended that meeting.
Anyone considering a hunt in Alaska that will include flights should ask a few questions about who is flying the planes, etc before spending big bucks. That said, the guide industry really doesn't have a bad accident record in Alaska, but due diligence is always a good idea.
MTV