Some of those are not very good reasons to spend my hard-earned piano money, and most of them are worse ones for spending Paul's hard-earned cash.
If I am completely honest, the first six items on the list are responsible for probably 95% of my yarn purchases. Yet, the rest of the list, representing the other 5% of the yarn, seem like more viable reasons to buy yarn. The need for clothing; the need for a reward for a battle fought or a task well-done--the something for something way of life, instead of the pile-it-up, acquisitional way of life.
Can I stop acquiring, just for the sake of acquiring?
That was just a rhetorical question. I don't think there is an answer.