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To update prices at AS, you have to hit the update prices button. They will not update on their own, except maybe once or twice a day. Update prices IS only avaliable every 5 minutes. AuctionSniper wants to spend processing power placing bids, and not updating prices every 5 seconds.
If you want to continously update prices as the auction nears end, it's best to do it at eBay. It will not work on your My Snipes page.