It's fine if you use Science as long as you sell me something of real value, so the transaction is win-win for both of us. It's not fine if you trick me into buying things that have little or no value for me. Also, if you had something valuable to sell, you wouldn't need manipulation tricks.
It's not a devastating rebuttal to everything you were saying, but it is highly relavent as a pompt for you to clarify your point - which this is a good start at. I don't think we're quite to somewhere cogent, though; real value is subjective, so I'm not sure exactly how we draw that line - particularly when it comes to entertainment. If a salesman convinces me to buy the pricier golf clubs, maybe I will have a "better" experience out playing golf, but under what conditions is that "real value" when I would have had fun and got exercise either way?
