not good for ebay.. Piper Jaffray is surprisingly negative on eBay (NASDAQ:EBAY), saying their proprietary count of worldwide eBay listings suggests total Q4 listings of between 578M-590M. These results are between 8%-11% below their 639M listing estimate for the quarter and could potentially be sequentially down in the seasonally strongest quarter (listings were up sequentially 19% in 4Q05 and 17% in 4Q04). While listings were expected to be weaker than in previous years due to the changes to Store listings, with a second sequential quarterly decline, and listings below expectations, estimates are likely to come down. Assuming firm's range of a listing miss of 8%-11% is accurate, eBay would need a corresponding increase in revenue per listing of 8%-11% in order to match their $1,052M estimate for Q4 auction-based revenue. Firm notes that their estimate for total revenue is near the mid-point of company guidance and $21M below the Street consensus. Without any improvement in revenue per listings, the shortfall could be near $100M. Current Street consensus estimates for 2008 assume growth accelerating from 21% in 2007 to 22% in 2008, despite the marked slowdown in growth eBay is seeing across its core properties. Considering that slower listings growth indicate that 4Q06 overall growth will likely only be between 21%-23% (down from 42% in 4Q05), PJ believes that expectations of over 20% growth for '07 or '08 are unrealistic. Firm's newly released 2008 revenue estimate of $8,142M is $568M below current Street expectations and assumes 16% growth in 2008. Maintains UP and $25 tgt.