Ian Lurie of Conversation Marketing has created a handy tool to calculate what you can afford to pay in pay-per-click advertising deals such as Google AdWords. One thing you discover very quickly is that you need one or more of the following to make the calculation pay off for you:
1. a high-priced product (over $40.00)
2. a high click-through rate (not likely, but testable)
3. a small click-through price (10 cents or under)
Try out the following easy-to-use calculator to see what you can afford to pay for a click: http://www.conversationmarketing.com/clickworthsale.html.