its not the size that matters its what you do with it that counts!
Keyword specific domains that would be easier to get a high ranking in a market usully sell for big $$$ now. i.e.
www.computer.com
In the old days back in the 90s as all domain names were up for grabs peopel used to buy the ones they knew would be wanted by big companies like coca-cola.com and sell it to the company when they went online but there's laws against that now (that domain name was an example I don't know its history)