It’s a common error on yahoo.com — and throughout Yahoo! where its writers and editors lurk — but I wish it were rarely seen:
That hyphen joining the adverb rarely and the adjective that follows it is a problem. It’s just unnecessary and wrong. Just as it is here, too:
When an adverb ending in -LY is followed by an adjective, there’s no need for the hyphen; the -LY is the signal to the reader that the adverb modifies the word that follows it.