Logged in this morning to check the latest goss and saw that one of the side adverts on the Front Page is for a Chineese fake iPhone. Whats the go with that?? 
Many sites and forums do this. Google does not let you handpick. I have seen sites that are covered with adds for paid jailbreaks and unlocks that I know 100% they are against. this forum and other sites have to cover the cost of running them somehow.
Macrumors does not control what advertisements appear on site. They subscribe to a ad agency and ads are pulled from a pool of ads.