Airbnb lets us set a nightly price for additional people, but that setting almost never reflects my actual costs. A 2 night booking with $10/night for each additional guest prices out very differently that a 2 month booking. VRBO lets hosts set a one-time fee for additional guests, which makes a lot more sense since extra guests generate a lot of one-time costs (like extra bedding and towels).
I would really like to be able to do both: a one-time fee for each additional guest, and a much smaller nightly fee to account for additional utilities and wear & tear.
Has anyone found a smart way to price extra guests using the existing settings?