Sometimes when shooting catch and shoot shots, it is easy for a player to get disinterested, or the drill becomes boring. The baseball scoring basketball 3 point shooting drill doesn't do anything crazy or different than a normal catch and shoot drill, but the scoring is fun and different, so it keeps the player interested and motivated while shooting.
It is also a good shooting drill for practicing your form and technique, because you should be shooting the basketball the same way every time. Along with getting up a lot of repetitions, the drill will help to work on mental strength for the shooter, and also learning to shoot under a little bit of pressure. Mixing in basketball drills like this to your workouts will help keep them fun, and also keep the players engaged.