Taxes, insurance, utilities and upkeep run whether anyone lives there or not. Most owners have never added them up.
Most policies change or lapse once a house is unoccupied, and vacant-property coverage costs more than the policy it replaces.
A burst pipe in an unheated house in February costs more than a year of every line above put together.
Every month it sits comes off what the sale nets you, whichever way you eventually sell.