I made a blog post recently on Adwords and costs - for example, say you pay $1 per click, and 5% of the people buy (a very good rate). You can figure out the cost per sale easily with a little math: (PRICE PER CLICK) / (PERCENTAGE BUY) = (AD PRICE PER BUY) In our case, $1 divided by 5% (0.05), or 1.00 / 0.05 = $20.00 or $20 per buy. Look at it another...