It's not my job to tell other people how to make money. They all got good prices from me that they were happy with. If I had a model for stock trading that was

It's not my job to tell other people how to make money. They all got good prices from me that they were happy with. If I had a model for stock trading that was better than the people I was trading with, is it unethical to use it since I could just tell people the stocks are worth more and they shouldn't sell it to me? I buy products for resale all the time, and I don't need to tell the people I buy from how much more I plan to sell it for. (Plus, some of the product was bought from larger companies that would never have bothered to get the refund themselves. One person I bought around 20 peaks, I'm pretty sure they were selling them on Amazon before they banned the listing and needed to liquidate. Some stuff I bought from Amazon directly, where it would clearly be impractical to tell them.)