He is your agent so give him a call or ask for an explanation.

So that would be the first explanation for significant mismatches between the asking price and the Rental Zestimate. 

You can certainly withdraw your offer - even if they signed it and you did not.It really isn't necessary to provide your potential mid-term tenant an explanation for your actions.  

The area is geographically restricted and naturally prevents urban sprawl like in other markets.

Your explanation of the various ways something similar could happen makes sense.

If a contractor is stepping outside his normal geographic area for a good customer, I think it's fair for the contractor to ask the customer to pay for at least some part of the bond/licensing fee... he may not realistically use it again before it expires.

If one really wants the actual statistic you should consult the data provided by Airbnb itself.For example, even in one local geographic area, between Hilton, Motel 6 and RedRoof Inn, they have various occupancy rate.

Are they allowed to just rescind Rules & Regs with no explanation? 

@Winter Jones,To qualify for the Solo 401k you must have legitimate self-employment activity, here is the explanation from the IRS, you must meet those criterias: https://www.irs.gov/businesses/small-businesses-se...

But in some geographic markets, STR's are WAY UP.