Having you spend money on a product you end up liking is positive for both parties of that transaction. Imagine it's a book you like, and you recommend it to others - who then buy it too to read it. Or a song you get others to hear. That's a happy customer of an arbitrary product. Does the author or artist know who you are personally? Of course not, but they didn't need to for them to care about their customers and make something that they enjoyed.