There are venues for authors to commercially market their works. PG hasn't been (and really shouldn't be) one of them.
Personally, this is the view I would tend to share. Although I do understand Greg's message about PG having fairly broad goals. There have in the past been many one-off items that are a little outside of the normal things that PG offers. However, here is another view that I just received via the catalog report address: Date: Mon, 9 Aug 2010 16:28:51 -0700 (PDT) To: catalog2010@pglaf.org Subject: Spam disguised as books The publicity samples of Robert J. Sawyer's novels Wake and Watch have somehow been added to your catalog. If Project Gutenberg is now augmenting its finances in this way, there will obviously no longer be any need for me to donate. If not, please either put forth the entire books, or remove the spam. -John Fluker