I recently ran across a white paper by CERES entitled "Flaring Up: North Dakota Flaring More Than Doubles in Two Years" . The paper presents some pretty interesting statistics on the basis of the flaring (remote well locations and low value of the gas compared to the liquids) and the expected recovery of flared gas in the future.
Some interesting stats included:
The paper also outlines the outlook and also provides some recommendations for the future. Needless to say, monetizing the natural gas is one of them. The fracking behind the flares was also the topic of a recent National Geographic article at http://ngm.nationalgeographic.com/2013/03/bakken-shale-oil/dobb-text.