you can make any site rank with development as unique content is king, with that said though a keyword rich .com domain that describes the exact product or service you sell will have a slight advantage based on how many searches a month are shown for the exact keyword phrase as a high amount of searches for a generic term will translate into type in traffic, type in traffic converts as they typed in exactly what they were looking for so if what you have developed is a match $$$$ in the bank, my opinion is based on 1000+ domains under control and over 100 developed into niche stores and white labeled and the keyword .coms always do the best whether I park them, make them niche stores, white label them or fully develop them as any type in traffic will always fall to the .com as it is the most widely known and promoted.
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