Ethically, you must be honest and upfront with your customers. If your experiment involves misleading the, in any way, then ditch the experiment.
I sure as hell wouldn't want to be the unknowing recipient of his "experiment".
I sure as hell wouldn't want to be the unknowing recipient of his "experiment".
If you didn't like the experiment you had the possibility to opt-out and never become a customer of him again, without having to pay a single dime.