Tracking == Bad
Why bother? Your ads are going to be adblocked. All your work matching up the perfect bit of offensive crud with my profile will be wasted.
Were your useless "service" fully anonymised, I wouldn't care. However, I don't think it is. You are building a list of very personal information linked to a unique ID. Just because that ID is not my name, does not make that acceptable.
Until advertisers stop using infuriating advertising tactics that look more like browser ambush (flash rollons or coverups, popups, popunders, anything opening in a new window) or attempts to melt my eyeballs (flashing, blinking neon, YOU ARE THE 1,000,000th VISITOR type rubbish) people like me are increasingly going to resort to blocking all flash and javascript and will filter images by using blacklists of known spa^H^H^Hadvertisering servers. Targetting adverts will not help - I don't care what the advert is for, if it is annoying simply by existing.
More and more I'm thinking that there isn't so much of a divide between spammers and 'mainstream ' marketing. Maybe we need a Phormhaus to block all sites connected to networks that distribute malware, tracking software / cookies, or produce in-your-face adverts?