are the houses your looking at empty? when i was looking at bank owned houses 3 years ago alot of them had power on and off so basements were flooded since sump pump had no power. hell the house i bought had a tree that had fallen on roof making a hole in it and was like that all winter with the heat on full blast. lol there are so many empty houses they cant keep up with checking on them anymore. my 2 cents.
i bought a slab but i really wanted a basement but could get what i wanted with the price i could spend.