Two reasons come to mind: - You want a distinctive dress for an event. You don't want to be seen wearing the dress at another event. Or: you don't go to formal

Two reasons come to mind: - You want a distinctive dress for an event. You don't want to be seen wearing the dress at another event. Or: you don't go to formal events often enough to justify buying a formal dress that might be out of style next time you need it. There are a lot of reasons you might not want to use a dress beyond one evening. - Your $150 will get you the use of a dress that would cost you close to 10x that at retail. Basically, RTR is a hack on how fashion works.