No, they can't. Marketplace Rules - Mac GuidesThere a marketplace board here if i recall correctly. You can try there.
This may answer some questions about the policy: Announcement: Major changes for the Marketplace forumBefore you can access the Marketplace forum, you need a minimum post count of 250, as displayed in your User Profile, and you must have been a MacRumors member for at least 180 days (about 6 months).
If you start a "for sale" thread or make other Marketplace-type posts in another forum to avoid the minimum requirements, your thread/posts will be deleted.