hard to get enough traffic as gawnd said, but very very well converting traffic. The highest quality of all search engines. At least this is how I interpret it based on my own experience
Do you think you are better off with WhyPark.com than with traditional parking sites such as SEDO, and how many sites do you think you would need at WhyPark.com to recoup the $100 fee?
Adcenter has the traffic depending on keyword... I've gotten over 7,000 visitors in 12 hours from them on a fairly high paying keyword that converted very well for me as usual. That was just on one keyword going to one site.