The TV ratings would go up so much that *all* of the Indy Teams would become profitable, especially if Paris Hilton won and there was a pay-per-view for the winner's circle traditional kiss from the trophy girls.
...And lets face it, without sexy women in the hunt for the checkered flag, the sport is too mundane to attract a big TV audience (live attendence is a different beast, though).
Besides, racing has so many rules in it now that mandate so much evenness between cars and teams, that relatively inexperienced female drivers really can win now.
It was only a matter of time before the teams figured that much out, too.