Plenty of disadvantages of Khao Kho, no question there. In my estimation Khao Kho has 3 distinct advanages over other areas of Phetchabun: weather, weather, and weather! It is substantially cooler, breezy, and rainy. It is telling that the weather difference allows planting of many types of fruits and vegetables that are not workable at the lower, hotter altitudes. I also looked at land in the "khao kho" of Loei, namely Phu Ruea, but to my dismay even crazier higher prices abound there.