Some have been able to by slapping their iPod with a little bit of force (not much) against their leg or a somewhat soft surface. Usually it was only a temporary fix though.
As to whether or not it is worth the cost to have it fixed is entirely up to you. How much it costs depends on whether or not you choose to go with Apple, a third party service, or opt to swap out the drive yourself. Here is Apple's pricing: http://www.apple.com/support/ipod/service/prices/