ok first find out how much you'll be getting from adsense then find out how much it will cost you to keep up the site. then subtract the amount from adsense from the amount to keeps it up. if it's a negative number go for it!(negetive means profit)
e.g.
adsense amount per month: $10
amount to have website pm: $9
$9
$10
___________
-$1
that means you get $1 profit per month.
]]>