The better question to ask is how many sites do you have that make money?
4 sites
just purchased few days ago
still not earning a penny .. but traffic is 1500 visitors daily..
well my thousends of free blogs are not autoblogs or spam blogs. all of them have readable and mostly unique content not to mention nice link juice.
It's not about the numbers though, it's about the architecture. Just like 1000 links can be a lot better than 1 million links.