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Power Sellers are required to have scores in each category above 4. The winning bidder pays the second-highest bid plus one bid increment amount that is, some small predefined amount relative to the bid size , instead of simply the highest bid. eBay was ranked 13th [] , after other large sites such as Amazon and Craigslist , as well as lesser-known selling sites such as Atomic Mall , eCRATER , and Ruby Lane. The listings of sellers with a rating of 4. eBay also allows sellers to offer a "Buy it Now" price that will end the auction immediately. Charity auctions[ 編集 ] Using MissionFish as an arbiter, eBay allows sellers to donate a portion of their auction proceeds to a charity of the seller's choice. Buyers are asked to rate the seller in each of these categories with a score of one to five, with five being the highest rating. The Buy It Now price is available until someone bids on the item, or until the reserve price is met. Early bids will usually not increase the bidder's chance of winning the auction, and will often raise the item's final price winning bid for the eventual winner. Unlike the overall feedback rating, these ratings are anonymous; neither sellers nor other users learn how individual buyers rated the seller. However, since the bid increment amounts are relatively insignificant compared to the bid size, they are not considered from a strategic standpoint []. In a reversal of roles, on January 24, , Auctionbytes. eBay was rated twelfth out of fifteen in the Recommended Selling Venue category. com held an open survey in which sellers could rate eBay, as well as competing auction and marketplace sites []. The winning bidder was not made public, but was able to bring up to seven friends to the lunch.{/INSERTKEYS}{/PARAGRAPH} {PARAGRAPH}{INSERTKEYS}Services including any sexual activity Links to sites that contain prohibited items Adult products that are delivered digitally Ivory products [] Knives , other than some cutlery , are prohibited in the UK following the criminal importation into the UK by BBC Watchdog researchers of several knives that were already illegal to own or import under existing UK legislation. The highest bidder's bid is sealed, as in a Vickrey auction, but the current winning bid second highest plus one increment is displayed throughout the auction to allow price discovery []. eBay provides a partial refund of seller fees for items sold through charity auctions []. Seller ratings[ 編集 ] In , eBay implemented a system of seller ratings with four categories. When the Buy It Now option disappears, the auction-style listing proceeds normally []. In the survey, users were asked to rank 15 sites based on five criteria: profitability, customer service, communication, ease of use, and recommendation. Some respondents stated they would have given eBay a rating of 10, three to five years ago. In individual category rankings, eBay was rated the worst of all the 15 sites on customer service and communication, and average on ease of use. Some high-profile charity auctions have been advertised on the eBay home page []. The ban also includes empty leather knife scabbards if they are listed under the category of "knives" on one of the eBay sites [] Souls , ghosts , and other "items whose existence cannot be verified" are prohibited. Because eBay's auction-style listings are sealed-bid, it is usually to all bidders' advantage that bids are made only at the very end of the auction except for an initial minimum bid, that cancels out a "Buy It Now" option, or prevents the seller from ending the listing early.