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Things can change quick on ebay...something can be selling like crazy. Then, boom, its dead in the water. I was in the Pittsburgh area around Thanksgiving and picked up some footballs for $7.99 each because they were bringing $29.99 on ebay. They were the collectible footballs from their Super Bowl victory over the Arizona Cardinals.
Since that time the Steelers have been on a downward spiral...probably not even going to the playoffs. Selling them off @ $9.99 just to get rid of them. Hardly, worth the hassle!
Point being that not everything you buy will bring big profits on ebay...don't give up!