@Betty124
No such thing as a silly question Betty....unless you're asking about an interpretation of Airbnb's rules!
I have come to the conclusion that the propensity of one night stays is linked to the extras that are charged onto the listing amount.
Someone sees a listing at $140 pr night and sees an equivelant listing in the area at $120 pr night with a $70 cleaning fee...If it is a short duration booking they will automatically take the first listing because in reality, it still provides what they want but it is $50 cheaper. As the length of stay increases that cleaning fee becomes split on a nightly basis and the price comparison becomes less of a stumbling block.
I don't charge a cleaning fee and I find that 70-80% of my bookings are for one night....and I don't mind that, I could drop my hosting amount and charge a cleaning fee but I would be worse off if I did! I don't get a high percentage of bookings for a long way in advance, most of them are opportunistic....someone sees the night they want is free and grabs it.
What you could do Betty, is say to the guest, "I understand travel plans can be fairly rigid but I do have a policy of offering a discount for longer term stays". That may get the guest to thinking it could be advatageous to take an additional night or two.....everyone likes to think they are getting a bargain.
Cheers......Rob