I must admit WhackAWhine's in your face "I'm here so use me, I'm here so use me, I'm here so use me" irritates me, but I can live with it - or rather live without it.
If it really is inserting advertising, I'd have thought that would be a significant turn-off for most people. Since it is clear and visible, punters can make their own choice.
But clickjacking is invisible and deceptive. Is there any practical way you could warn users (and maybe remind existing users) of the clickjacking?