That will be attractive to some passengers and I'd guess overall you'll burn less fuel than adding an extra landing & t/o so it's good for the airline
In a previous life I worked for a DC10-10 operator whereas our LON/LAX/LON services, and occasionally our Florida services, would fuel stop in BGR where the punters would have the opportunity, westbound, to clear US immigration arriving at their ultimate destination as domestic passengers.
Once we acquired DC10-30's services operated direct but with the extra tankering of fuel it would have been cheaper to continue tech stopping in BGR ... But punters preferred direct services.