[tremon]

In the end, Google should care. If a search for "best car engine oil" got your product featured, that means you won a sale. But assuming the sale happens completely offline, Google lost its opportunity to inform you of the search, and of the succesful search->sale conversion.

That means your marketing department can no longer justify investing money in Google SEO, which means less optimization towards Google's crawler, which means less reliable search results, which means less Google searches in the long run.

[bartimus]

Increased profits from unknown sources VS decreased profits from known sources. The gained marketing intelligence may come at the cost of the bottom line.