The income sounds totally realistic. Whilst CPC (charging per thousand clicks an advert receives, I operate a successful site where I charge a fixed amount for my banners monthly, I am fortunatel in that the site is respected and focused allowing me to charge a premium for my advertising. CPC is not the only way to go, but even if you choose that way as long as you have the volume of traffic ?1000 is realistic. Google adwords could be one way of achieving this income easily without the hassle of finding advertisers.