
when you first look at this you think Dave most be crazy, he is losing money by running PPC , but you start looking a little closer you see a pattern.
the next 2 screen shots show me the times and what happen in a organic sale.

and

You can see this visitor can to the Site at 7:40 for a model number keyword listed in the organic serps, later in the day he came back twice again via organic serps this time the keyword was the url of the site but this time he purchased.
but you see the yellow box that say supported, well that means that the customer originally came from a PPC click, but what I found interesting was:
Customer in the Research Mode
Searches for single keywords example “laptops” or “Mobile PCs” ( in fact I did that today lol ), I was looking at buying an eeePC change my mind and started my research with “ultra light laptop”.
once in the research mode I start collecting a list of Model Numbers or manufacturers.
Customer in Purchase Mode
I start searching for model numbers, Like so many other users I guess because a site I found originally advertising on PPC with Mobile PCs, when I saw them listed organically for the model number I wanted to by, I clicked the listing and purchased.
DaveN