I too do this in reparation for the sins committed against Her immaculate Heart. A penance of sorts. I also will offer it up for others who are suffering or the souls in Purgatory with nobody to pray for them or those in prison with nobody to visit them, the sick... Since I began praying this prayer each day my pain levels have become much more manageable. And when I have those days in which it is very bad I know that it is being put to very good use. When I pray the rosary I am often struck with the thought of all the masses and prayers being offered up to Our Lord and Blessed Mother all around the world. It has given me great hope to meditate on this. The everlasting unending chain of prayers being offered all around the world. Somebody right now, in fact, a great many are praying.