You're clueless.
I'm speaking from first hand experience. I buy two new phones every year, an iPhone and an Android phone. AT&T spends millions advertising for customers like me that spend the money, maintain multiple lines, and buy lots of phones. My lifetime value to them is not something they take lightly.
Loyalty comes with great rewards.
No, I'm right. There are countless treads here of AT&T throttling Unlimited Data people.
You can choose to believe what you want, but they, like every other corporation, doesn't "care" about you. You are a number. They will stop Unlimited Data in the future. No matter how much you spend, once they decide it's over, it's over.
LOL at "multiple lines" meaning two. Two. Yeah, they would close up shop without you.