I would not sell my royalties if you're in Carroll County.  From a few wells surrounding me in Carroll County, they have produced -  if what is being reported is accurate.    The below production is provided by the Southeast Ohio Oil & Gas Committee Report dated Feb. 2012      

 The Buell 10-11-5 8H in Harrison County, Ohio was drilled to a lateral length of 6,418 feet and achieved a peak rate of 9.5 million cubic feet (mmcf) per day of natural gas and1,425 barrels (bbls) per day of natural gas liquids and oil (liquids), or 3,010 barrels of oilequivalent (boe) per day;

 The Mangun 22-15-5 8H in Carroll County, Ohio was drilled to a lateral length of 6,231feet and achieved a peak rate of 3.1 mmcf per day of natural gas and 1,015 bbls per day of liquids, or 1,530 boe per day;

 The Neider 10-14-5 3H in Carroll County, Ohio was drilled to a lateral length of 4,152feet and achieved a peak rate of 3.8 mmcf per day of natural gas and 980 bbls per day of liquids, or 1,615 boe per day; and

 The Thompson 3H in Beaver County, Pennsylvania was drilled to a lateral length of 4,322 feet and achieved a peak rate of 6.4 mmcf per day of dry natural gas.