I am just starting out in ppc as a consultant and I seem to be having problems with my clients. I had one company that sold central air units from their online store that I could not get to make necessary the changes to their website. They also would not increase their ad spend no matter how I tried to explain the necessity. Not to mention the fact that I was willing to go full commission because I new I could make them money. I did not mention that these guys were getting high click through rates and that their campaigns were doing very well. The problem was that their checkout system had more red tape than some small governments. That is one reason why even getting lots of clicks they weren't getting anywhere. They wouldn't let me write copy for their landing pages because they wanted to use the stuff from the manufacturers website. aaaahhhh!!!!
Anyway this is getting very frustrating. I don't know if I am picking the wrong clients or the wrong industries or if I need to educate them more before I start them out. The A/C guy had never made an online purchase before his son created the online store ( probably my first clue ). I could use some help.

These are all very common issues with PPC clients. They are also the reasons I have so much information on Web Design, usability and conversions in this PPC forum.

You will probably have to gradually help any client you may work with to better understand all of the complexities of e-commerce. Some will be more challenging than others and none are likely to completely understand what you're doing.

Both Yahoo Stores and Volusion have very solid shopping carts and are constantly improving their store solutions. Those sites usually have far fewer conversion issues so you might want to hang out your shingle where they may find you.

The best PPC products have an average sale of over $60 (either per item or people tend to buy multiple items) and they sell something that is well known, is manufactured in a huge selection of styles, colors, sizes and not widely available offline.