Students need feedback often and creating a system by rubber stamping work can provide visible and immediate proof of student progress.
Teachers work very hard to give all students as much feedback on their work as possible. Unfortunately, there are limits to how much time a teacher can spend grading papers, writing notes, and encouraging students. For example, each day, students often complete warm-ups, sponge activities, or some other pre-lesson assignment while the teacher takes roll and sets up for the day's lesson.
When I began my educational career as Spanish teacher, I quickly discovered that when some students realized the "sponge" work was rarely graded, they stopped doing it. My first reaction was to make it a graded activity. "Turn in all the warm-up papers" became less and less appealing to me as I realized that every time I said those words, I just doubled my pile of grading. Add this to all the other grading, and it becomes a daunting task to give timely feedback.