When I check out different shops, inevitably if I notice there are pages in the double digits, I know they've sold a lot, and when I see the amount of sales, that proves what I already knew. Having sections, too, is vital to help buyers and sellers check out your merchandise without having to necessarily look through 18 pages in your shop. I currently have 150 items in my shop, and when I had 180, I found I was having more buyers, and more frequently.