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Reports today say that MySpace may allow users to place ads on their pages, lifting the ban on user ads that's been in place for most of the site's history. The move would aim to increase MySpace's revenue, so no doubt MySpace would demand a cut of any ads you put on your pages. Certainly, we know it's very hard to monetize the unpredictable content on profile pages: perhaps they could get the members doing that job for them.
Still, the details are extremely sketchy, with CNN not really sounding sure whether this is ads on pages, peer to peer commerce (advertise your stuff for sale to friends) or something akin to Facebook sharing revenue with developers.