I guess about 120 right now...I also have about 500 domains. Most of my revenue comes from about 10 of the sites though. But many pay for themselves.
Well, almost half of his site are on Parking Page with Sponsored Links. 2 Sites are with mySQL Database Error. One site is bad design. One is not active, its showing PARENT DIRECTORY and the other on is good one but, he may be earning 10 Cents per day out of it coz its not showing relevant ads.
Thats a lot of sites! Do you guys have any advice what kind of site I should make? I'm aiming for a lot of traffic a day
You can use same code of adsense at all of your sites and make channels for each domains so google will track all the requests for you.