Sales are down because of these reasons
1. eBay payment gateway has problems since January
2. eBay payment gateway is not functioning good since they have moved to Bill Desk.
3. eBay gift coupons are not working
4. eBay gift vouchures are not working
All these problems are not addressing by eBay but as I'm seller and buyer on eBay I've faced these problems. If eBay don't fix these issues, sellers and buyers will look around for other shopping sites.
eBay ID: MemoryCardsIndia
eBay shop:
stores.ebay.in/gadgetzone