I have found that many of the old timers liked PPC, but the cost is high and you must be very good at converting if it is to pay for you! The keywords are the key, but be careful and never bid more than you can afford to lose. The free money is a great way to test out the system. However I have never converted a PPC and have made quite a few sales from free sources.

If you can hit a pool of qualified buyers then PPC does work. Kyle and Carson have used it quite a bit and their early courses on it were quite popular. However tread carefully it can be like gambling.

No experience at my end.

I've made a few sales for the WA affiliate program with Bing, but that was before WA implemented their PPC tracking system, so I didn't really have any idea which keyword was the one that converted.

Now that WA has implemented PPC tracking system I will probably give promoting WA on PPC another shot.

I've always struggled to make more money in commission than I spent in advertising costs with PPC. That is mainly not being able to track at the keyword level which one's are converting since a lot of vendors don't let you put your tracking script on their thank you page.