Let’s start with dashed domains. It has been proven statistically that domains with more than a single dash are very likely to be spam. Multiple dashes in a domain was an early spammer trick because of the low barrier to entry with cost. This rules these out. Don’t bother with a double dash domain.
It is very common to see domain names that include a single hyphen, but when two, three, or more hyphens are present, this is often an indication that these domain names are associated with companies that are attempting to trick search engines into ranking their web pages more highly.
From this amazing patent post by Bill Slawski regarding EMD's and detecting commercial queries.
Even though there is plenty of evidence that a single dash domain can rank just fine, I would avoid this technique as well. Many of the single dash EMD’s that rank are old existing domains. It is my opinion that a single dash EMD still really provides very little advantage over a non-keyword domain with all things considered. Skip the dashed domains as well.
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