Hyphenated Domains
Hyphenated domains are still selling in todays marketplace. In general, adding a hyphen may devalue your domain about 25-30% of its appraised value. But, this may vary from buyer to buyer. Some buyers are not biased against the hyphen, while others frown about the matter.
I would say that if its a good keyword phrase, register it!
PS: Hyphenated keyword phrases makes no difference with SEO as Google will award the same keyword values if you optimize for the standard phraseology with your title, meta, and Alta tags. (e.g. Free Money, )