I know for most people, Solo Ads are the best source of paid traffic. However isn't it true also that the traffic you will get from solo ads are most likely fellow marketers or people who are in other lists as well who are getting tons of similar emails from other people?
PPC however, say for example Facebook ads. Most people who will see your ads are just ordinary people who probably don't have any idea what internet marketing is. And if your headline is something like "Earn $200 Per Day While Staying at Home", isn't your chance to get them to buy something from you much bigger?
Just my thoughts, wanted to hear what you guys think.