Idaho law does not license travel agents. However, other states do. This is where you run into a logjam, because in each jurisdiction where you market your services, there are different licensing regulations -- which means that you could be subject to the laws of every U.S. jurisdiction where you do business.
This is a big job, though not impossible, because there are companies that do it (Travelocity, Orbitz, etc.).
That said, you may want to consider setting up your system to permit the sellers and buyers to use the system, while you simply charge for the use of the venue itself.
This is allegedly, the system used by this website, eBay, and other such "venues."
Hope this helps.
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Hotel and Transient laws also differ by jurisdiction. Moreover, local county and municipal zoning regulations may impact the B&B's operating rights.
In general, a B&B needs to obtain a hotel business license to avoid being treated as a residential dwelling unit.
Calling the payments gratuitous suggests that something is donated without expecation of any return obligation. This would mean that no one is required to provide room and board. I don't think that a customer would be much interested in paying for the mere possibility of a B&B stay.
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