The restrictions on Mosul residents only apply if they go into government held Iraq territory

The restrictions apply only for those wishing to head south into government-held Iraq; residents can still travel to and from Turkey. Those leaving for urgent medical reasons now also have to provide collateral, and can only leave if their claim is approved by a special medical committee made up of IS-loyalist doctors.
end quote from:

http://news.yahoo.com/group-tightens-grip-mosul-residents-064137341.html 

The (ISIS) logic? here appears to be that if you are going into Sunni Territory (like Turkey) then you don't have to sign away title to your home in Mosul (if it is worth $20,000 or more or your car if it is worth $20,000 or more) if you leave and head south into Shia Government held Iraq. This seems to be the thinking of ISIS. It might be important to note that Mosul had 2,000,000 (million) residents before most of them fled in cars and other vehicles or on foot before ISIS came in there last June.