I've noticed recently that a few auctions I had set for Featured Listings have been downgraded to Free auctions. I read the listing FAQ and realized that this is mentioned in there (although I don't remember seeing the 60 day limit anywhere while posting), but I don't think it makes much sense and I'm kind of put off that my best items are all being slowly bumped to Free auctions.
Seems like once you pay the Fee for a Featured listing it should remain a featured listing. Or at the very least, there should be an up front message to the seller that says, "Only good for 60 days."