First of all;
We could be talking about two different SELLERS here:
If we are talking about a Homeowner; they would have a vested interest in maintaining the property to get the highest price possible.
If we are talking about a Bank, (in the case of an REO or Shortsale), they probably have never seen the house, and have only another person's word on what is needed: The Bank has no incentive to spend another dime on the property, even if vandals choose to tag it.
We have all seen houses, on a NORMAL sale, where a coyote wouldn't live.
We have also seen REO's that were beautiful turn-key houses.
But Banks sell distressed houses As-Is for a reason.
Good luck and may God bless