We just sold my mother's house last year. If your walls are damaged or dirty then it pays to paint. Otherwise, I agree with teachercd-leave it. Our realtor took pictures of the inside and outside of the house and put it on the website. People are more apt to come look at a house when it looks good. We got the price we wanted so was glad we put in the extra effort to make it look nice.

On a side not...years back I looked at a nice bank owned home...the parents must have been pissed because it looked like they gave their kids markers and let them go to down on the walls and doors.