I had a load of nice baby and child clothes, equipment etc, all sorted to be excellent condition, good brands like Jojo, White Company etc. I paid for a table at a local children's second hand sale, for what was supposed to be a well-attended market. Only a handful of people came. We made less than £5. Clothes were fairly priced (checked other stalls, and other sites where these things are discussed). The organiser said it was very unusual to have so few people, we were unlucky etc, and to try again because normally people are stripping the tables bare.
We did, reduced the prices further, and this time made £3 profit once the table was paid for. Again very very few people came. Most people there went home with tons of stuff.
I've given up now and am giving it all away (I'd already given a lot away but don't know that many people with DC the right age).
Does anyone have a good experience with these places, or is it always bad like this?