I have an own forum and I am searching for the best way...

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...to make some extra money with it. My forum is based on php-fusion and it's forum of our mmorpg guild. It's add free. But I am wondering if I could make some money with this too? Through adds? Adsense? Through a search engine? Do you have an own forum you make some money through? If you have one, what do you use to make increase your online money? Please let me know of your experiences! Thank you!