LOL - i have a couple of friends who are like your mom, too!
to me, pre-loved clothes are softer & better & broken in. have you seen some of the fashion "trends" lately? people are paying ridiculous prices for things that are ripped & threadbare. c'mon, y'all, that's just silly.
I've got a few pairs of jeans that should bring in a pretty penny on the designer "farm look" jean market. I'll even throw in some straw! They are a bargain at $600 a pair (lol).
I agree, stuff that's been washed already, you know exactly how it will fit and feel after you've thrown it in the washer.