Why some of teacher teacher's day must receive a gift?

Why some teachers, must teacher's day receive a gift? This issue is very not specific, whose gift, did not say to be clear about, the gift of student parent cannot want stoutly, I taught a few years, there is not student parent before, teacher's day gives a teacher give sb a present. We retired now, if have student teacher's day, do not have two jins of apples, or one case milk can close, this is word unripe intention, not why. If say the branch is led, or from already working unit, teacher's day buys gift to the teacher, this wants, annual teacher's day is longing for, waiting to want, benefit of this since show off, also show the care of leader and unit to the teacher, should want. The value not very of gift is actually important, important is intention. There is a common saying here, child birthday an egg, adult birthday a meal, the meaning is glad, glad. I answered a question, spoke the one's innermost thoughts and feelings that a lot of teachers should say. The thank invites, thank.