I do remember "in demand" nappies going for a reasonable amount (eg blueberries for a tenner when they were £16 new) but I have mostly listed stuff below half price. But then quite a bit of my stuff was secondhand to start with. I never really had a lot of embroidered nappies etc, preferred my beautiful pastel fuzzis
and I haven't sold all my remaining nappies but I did get rid of most of it. Plain stuff didn't really sell (eg BG v2s) but all my natural fibre inserts went and most of the "glamour" nappies.
I still reckon I saved a ton of money, think I spent about £450 from 6 months to PT, and got back just less than half of that from resales. She also wore a cloth nappy at night once she was dry at night for nearly 6 months, so we saved a fortune in pull ups!! (we used sposies at night originally)