As of right this minute, there are
290877 sellers
All of which have items in their shops. These numbers are approximate as of this minute and constantly change, however:
21 Shops have at least or OVER 2500 items in stock
13 Shops have between 2000-2499 items in stock
180 sellers (approximately) range in the 1000's range
200 sellers between 800-1000 items (fluctuating)
200 sellers between 600-800 items (fluctuating)
200 sellers between 500-600 items (fluctuating)
365 sellers between 400-500 items (fluctuating)
Most of the above sellers are listing items and updating their shops daily. That is only 1179 members or so.
That means the huge remainder of Etsy, 289698 members keeps under 400 items in their shops.
You can see all sellers and sort sellers by items here: (20 items per page)
http://www.etsy.com/shops_sellers.phpHos much do u keep in your shop?