Of cource it factors in how much you promote that particular site but if you judge the content.
In my opnion it seams that sites that promotes several high selling affiliate products is more
profitable than sites that only consists of adsense/ebay/amazon (automatically inserted info) not so much actual content, they might be quicker to create but affiliate commisions are quite low instead.
I´m only guessing here since I havent made my first buck yet.
What is your comments about this?
How can you make a website more valuable?