! I use the Gloria Jeans one , and now I only have to pay $ 3.30 for my regular cup ( which is about 400ml ) . I also have the frequent customers card , so when I drink 10 cups of coffee , I will get one free , which makes my coffee $ 3.00 each time ! ! The priviledge of committing myself faithfully to one coffee provider is huge ... !

Based on the preceding passage, answer the following question Why does the writer use the frequent customers card ?
None of the above choices .