I've been using AdWords for over three years off and on, and rarely do I recover the cost of the advertising. The cost per conversion is usually much higher than the profit from the item sold, sometimes far more.
In the beginning, I targetted very broadly, going for keywords such as "Acme Widgets", as well as any individual model ("Acme XYZ Widget"). As I watched myself burn through dollars with little or nothing to show for my money, I narrowed the field by specifying the model number in the keyword, figuring that anyone who knew the model number was more likely ready to buy than someone just looking at Acme widgets.
That lowered my spend, and I'm still getting a decent number of clicks. The problem is that they're not converting. I've put my prices in my ads, as my prices are lower than 90-95% of my competitors.
I've paused my ads now, as my cost per conversion was getting to two or three times the profit from the sale of an item.
I have competitors whose prices are as low or even lower than mine, and who advertise all the time. I can only figure that they're getting a lower CPC than I am. I don't know how they get that, though. Is the CPC lower as you advertise more or longer with AdWords?
I get a very good conversion rate through Google Products, as well as organic results from Bing and Yahoo. AdWords just isn't doing it.
Any ideas as to what I might try?