Both.
Some books are planned (either waiting for the release or the price to drop), some are impulse purchases - I see a book, it looks interesting and I'll buy it, if the price is acceptable. I never resist my impulses - when I want something and I can afford it, I'll get it. That goes for most everything in my life, actually. I don't practice any self-discipline. Fortunately I'm not a particularly impulsive person overall and my wants are pretty modest.
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