In a survey conducted by consumer experience and insights firm WD Partners last year, more than 71% of respondents said they shop secondhand at least once a month. Some 11% do so daily. (I’m thinking most of those folks are collectors or resellers themselves; some might be people with shopping addictions.) But another 26% shop secondhand weekly and 33% do so monthly. Their reasons vary: Some like the fun of seeking out “treasures.” Others want to save money and still others like the sustainability of buying used items or, in the parlance of auto dealers, preowned products.