Vinted Sales

So I've posted quite a few of Little Man's clothes on Vinted, as well as some of my own. I'm hoping to make some money from them, but since I've gotten most of the clothes he wears are from Primark, I'd not only be surprised if I can make a profit, let alone sell them. I've sold a few items over the last few weeks. I had heard a lot of positive things about Vinted but am a tad disappointed about slowly the sales are going, which is discouraging.