The effort involved makes Barnett Shale wells very expensive wells.
The issue I see with the Bakken is that unless you are in sweet spot [lots of communicated fracturing or maybe clean sandy streaks], the oil just isn’t going to flow to the well bore anywhere near as readily as would natural gas.
The Bakken wells are expensive all right but with the price of oil being what it is they are feasible for now. Total production from the entire formation is somewhere around 200-400,000 barrels a day near as I can tell, so it’s not earth shattering. The biggest drawback to increased production there right now is not the difficulty in extracting the oil but the lack of pipeline and refinery assets.