99.9% of the girls I write recs for don't pledge my sorority.
But occasionally.....they do! Happy happy joy joy!!
It's a numbers game.
Years ago, one of the chapters I wrote recs for had a "pledge trainer" who had the "pledges" write thank you notes to the ladies who had written recs for them. It was such a THRILL to get that note! I wish they would all do that.
One of the reasons for writing recs is to include alumnae in the whole process. It's such a great feeling when you do have a girl pledged...it strengthens your support for that chapter, and the entire Fraternity.