Ads through a network like CPMStar were the majority, averaged about $0.50 per thousand views. At the time there was also a flash game marketplace at fgl.com, t

Ads through a network like CPMStar were the majority, averaged about $0.50 per thousand views. At the time there was also a flash game marketplace at fgl.com, that let game portals like Addicting Games or Newgrounds bid to "sponsor" your game which involved adding their branding and links to their site. On my most popular game I made $100k over a few years.