Marktwain,
Have you got some links for this?
All I’ve heard is rumour and third hand stuff....
Here are three links:
http://au.ibtimes.com/articles/564182/20140827/obama-isis-oil-sales-middle-east.htm#.VE2qcRKYNok
http://www.nytimes.com/2014/10/24/world/middleeast/us-strikes-cut-into-isis-oil-revenues-treasury-official-says.html
http://thehill.com/policy/energy-environment/overnights/221734-overnight-energy-isis-oil-revenues-take-hit-in-airstrikes