I'm quite sure many people would be using Arne Brachhold's sitemap plugin for their Wordpress blogs.

I see that the sitemap page also displays the last time the page was edited.

Could this prove to be a method for Google to detect link selling? I'm talking about previous indexed posts which I edit in order while selling in content links from that post.

I understand that ordinarily ( without the sitemap) Google will see the difference when it crawls the pages, but with the sitemap ( which Google downloads every day), they'd probably have a better idea as to what the site owner is up to.

Any thoughts or comments on this?