Sometimes, it's possible to be too nice. Take Beedle, Wind Waker's amiable shopkeeper, for instance. He's the most friendly of friendly types, and knows that a positive relationship with his customers is valuable beyond the level of personal enrichment. Keep your customers happy, and you make friends and money in equal measure. Unfortunately, he hasn't quite got the balance right.
He'll offer you a loyalty card for his shop, and if you accept, will promise you bountiful rewards. The first of these, cashed in after you've made 30 purchases, is a compliment card. An exciting-sounding kick-back, and after that many purchases, surely a pretty lucrative one. Will it bestow you with discounts? Free stuff entirely? No. In this case, it's a literal compliment card. Cash in it, and Beedle will say nice things about you. Which is not only not as good as a free sword, but actually makes Beedle's pleasant countenance seem rather shallow indeed, now that I think about it. What kind of a friend charges a friend for compliments? Forget what I said about Beedle being too nice. He's a dick.