1,000 visitors daily to an ad-supported site is practically nothing. Maybe two or three bucks, tops. We get more than that to our documentation wiki site (which has no ads, and I wouldn't consider adding them because I believe it would cost us more in credibility to include them than it would make in revenue).

If the site is selling something, then 1000 a day can be a good start. A one man shop selling some sort of digital goods could do very well with that many visitors.