[danShumway]

You are similarly intelligent enough to understand that the actual person reading your email doesn't care about the distinction you're making.

If you go to someone and say, "don't worry, I didn't deceive you, I just profited off of your already existing ignorance", they're not going to be happy with that answer. Either you have their informed consent, or you don't.

To repeat, why does it make your customers uncomfortable to discover that they're being tracked?