Don't understand

Ok, so today I went to a consignment sale that is held in town twice a year. It's a huge sale, with tons of children's clothes and other items. You're assigned a consignor number and set your price, pay a consignor fee, print your tickets, put it on your stuff, etc. So, I go looking for good deals, which I would guess most people do, right? As I was looking through the little girl clothes I came across a cute peach shirt with plaid shorts set. The consignor price and description was : $24, (name brand) shirt and short set, new with tags. So, I looked at the tags (from the store), the price on the tags brand new without any discount was $16.99. So, my question is, "How can you take that to a consignment sale and up the price by $7?" I just don't understand.