Buffett: We learned a rule a long time ago: You can't make a good deal with a dishonest person. If you still have the hope of doing so, I advise you to give up.

Because when you make such a deal, your counterparty will always win. Berkshire and I personally will not waste time on such things.

Dishonest trading counterparties know more crooked ways. Although they may lose everything in the end, they will win in a single transaction and make you lose money, so I also advise everyone not to waste their lives on such things.