Always know what you are selling, but never let the customer know. People will pay anything to be first. Sticks and stones may break my bones, but I'll do almost anything for latinum. Never underestimate the power of reputation. Without profit, winning isn't anything.
Promises only sound like contracts.
The best things in life are worth more than what you paid for them. From each according to their ability, to each according to their greed. If you catch your relatives stealing latinium, steal theirs behind their back. We are not liable, they are. Good business skills and some Hupyrian beetle snuff goes a long way in negotiations.