--some attempt to give the page some legitimacy by linking out to established sites perhaps?
A common spammer approach these days. I don't see evidence that it's effective, but that doesn't stop the practice. --
Although it could be effective to get a competitor booted from SERPS if google demerits those buying links like that. How much is it worth to you to get into 1st vs. 2nd rank? Enough to buy links from them for your competitor?