I see that more frequently, american webmatsers throw away their old .US in order to grab .com dn
It's not easy to probe a future market for your name.
What's make the .com's market attractive is that more and more people want them, but they are more and more rare.
You want to develop an advertising website ( free like freely ?)
According to the price :
without dev between 20 $ and 50 $
If you find a market niche : when it's free, visitor won't pay anything and that won't be profitable for the webmaster
The price you can ask depend on the niche you are.
For example, you dn contains laptop your niche is a juicy market
I think this dn need dev to appraciate or you find somebody who can be interested to have free in is dn
SEE YOU AND HAVE A GREAT DAY
fAsTbUrNiNg