eBay lists items every day because it is an online trading platform where users can buy and sell items. Moreover, eBay has a global user base and covers many different product categories, with new items added and old items removed every day.

Therefore, eBay lists items every day to keep the platform active and attractive and provide users with constantly updated shopping options.

In addition, listing items is also one of the ways for sellers to display and promote their products, attract buyers' attention and conduct transactions. Therefore, listing items every day is to meet the needs of buyers and sellers and maintain the operation and development of the platform.