Hi Mishi
I wouldnt have a problem with it - but for those that might - it is a possibility that you could really have them go to your site that has the ad rotation on it - and just do a quick redirect once they are there to a page with the rotator script on it
Of course in the back of my mind I have to think that taking them to your site would be an excellent opportunity to filter them a little - and when they click on a specific niche - then pop them into whatever niche ad rotator you have set up
This would allow you to have the rotator return the niche specific FPAs for you - and of course since you have them on your page once they leave the free site we have listed - if they try to exit you can always send them off to a toplist or something - its your traffic at that point