If pissing me off after they've gotten $100 out of me means they get three other to spend $100, it's much more valuable than having me as a repeat customer. If someone found a way to triple my monthly spend but it made me miserable, said company would inevitably do it. Because if they don't, someone will come in, and eat them alive.
Advertising is purposefully inflicted misery, on all of us. The CEO of TF1, a french TV channel, called his job "selling available brain time to advertisers". That is all you are to them, whether we're talking about Coca Cola or Joe's Snoe and Foe: they want your money, because they die without it. Every company is a parasitic organism, and advertising is currently the most efficient way to spread.
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.