How much do you spend.

I am trying to get a sense of how much money agents and REO brokers spend with their REO listings.  With these listings come certain expenses such as power/water/lawn etc and mild repairs on house on occasion.  So on average what is everyone putting into these listings?  I know the power gets turned on but I was wondering why sometimes.  I really dont know any agents that show property at night and if a house sits vacant you should have good light during the daytime hours.  I am trying to get a general assessment of charges that are incurred on taking these REO listings.  Please let me know what some of you are spending for REOs.