Never accept any thing less than double your supplier's list price. Only a fool negotiates with his own money. Every dark cloud has a Latinum lining. Profit is as profit does. It is better to have gambled and lost than to never have gambled at all.
Money is the universal language.
Beware the Bajoran time of cleansing. When in doubt, demand more money. Life's not fair. Respect other culture's beliefs. They'll be more likely to give you money.