Before you buy or build a hostel, check out what needs to be in place in order to be able to get commerical insurance. The second you charge anything, you are now held to much higher standard for life safety. There really isnt such a thing as a commercial facility being "grandfathered' from following the rules. You may be able to get insurance for a business that doesnt meet life safety code, but you pay through the nose as it opens you and the insurance company up for significantly more lawsuits. Depressingly, many of the hostels on the AT most likely dont meet life safety codes and the ones who do mandatory "donations" or charge are one lawsuit away from losing everything they own.