I know a few of the members here are expert domainers, and I could just ask you in an email, but I thought I'd open this up so everyone can participate.
I've heard that buying domains, either existing aged domains, or newly registered domains can be profitable if parked.
Here are my questions;
How much traffic does a domain need to be viable when it's parked?
If a domain has no traffic, should a domainer promote it?
What else should a domainer do if a domain has no traffic but is still a good investment?