Unfortunately, this doesn't stop me from buying more. In particular, I can't resist a secondhand bookshop. It's the feeling, of course, that you might unearth an absolute treasure, or something that you've been looking for for years.
At the weekend, I was in Suffolk. There was a secondhand bookshop (no name on the front, other than 'secondhand bookshop') in the market square, so of course I had to browse. For under £15 all in, I bought two old Raymond Chandler paperbacks, the poet Tim Dooley's first collection, The Interrupted Dream, from the mid-80s, and the Reader's Digest Field Guide to the Butterflies and Other Insects of Britain, from their Nature Lover's Library series – I've already got the birds, trees and wild flowers volumes, and love them, and this was in the original hardback, in perfect condition.
The latter probably isn't going to get too much use until next year, but the Chandler and the poetry will be welcome companions on some forthcoming travels.