It could also be for financing to help you purchase your house. Not only do people know what the content is by the name, but if they think of the content first, the domain comes to mind. Think about a site for helping you with your taxes. Therefore, how common a word is definitely affects it's brandability. The most valuable domain names don't have any misspellings, hyphenations, abbreviations, or numbers.
Most domains have some good characteristics with a few less desirable characteristics.
These domains can also be valuable. Let our FREE Domain Valuation Tool help you choose. The CSVM underestimates the value of my domain.