I don't. When I see a book that I (think I) like, and I agree with the price, and I know I'll be able to liberate it (if needed), I'll buy it. No remorse.
If I think the price is a bit steep, or I think I might not be able to liberate it, I'll think twice. If it's a book I really want, I'll still buy it without remorse. Otherwise, I won't.
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