Id be scared of losing the bird if I flew two. You never know what goes on up there. What if one needs to autoland into the drink while you think it's doing a mission ?
When I fly the one I'm always monitoring the telemetry data including speed against or with wind, battery voltage/temp/percentage/individual cell voltage, motor rpm, time to return to home etc then occasionally getting a happy snap or playing with camera settings. Two drones for me would just be asking for trouble, at least for me.