If you had ever understood the true nature of the Holy Sacrifice of the Mass, you would never even think of asking this question.
I'm afraid, my friend, it is you who needs to grasp the meaning of having the same sacrifice repeated over and over again millions of times without ever realizing that Christ suffered for our sins "once for all" and that there is no more need of a sacrifice. Christ told us to take the bread and wine "as often as you do it in remembrance of me."