It can be, yes, but keep in mind that most of the work involved in a drone operation is in the planning and permissions phase - hours of planning could go into a 5-minute flight.
If the one picture you wanted to get required no extra permissions but a shot from the rear of the property would - then it would certainly be cheaper to just go for shots from the "easier" angle. Generally though, if we have put the work into planning the flight for one photo, we would certainly take a variety of shots that you can use too at no extra charge while we are at it.
One good aerial photograph of a house for sale can have such a massive impact on it's visibility and engagement on property websites, so the value returned nearly always outweighs the cost.