
Nami is greedy and will do anything for money, accepting any challenge that comes along. Her love of money stems from her childhood, where she lived a poor life and was often upset at having little wealth despite the love of her adopted mother. While she will send in Luffy and the rest of the crew to meet the demand, the one thing she will not do is sell out a comrade; no matter what the sum. She has several times put her own crewmates in debt over trivial matters (like Luffy for tearing her coat and Zoro for borrowing Beli100,000 only not to spend it and return it later), her usual charge for repaying the debt being 300% interest, and will often bring up these debts in order to get someone to do something for her. She takes control of the amount of money the crew spends, ever aware of the crews spending habits (such as Luffy's desire to spend all they have on meat) and tries her hardest to avoid it getting spent all at once. To this end, she is in complete horror whenever the rest of the crew wastes money or passes up an opportunity to get it. She is loyal to her money, but no matter how much she denies it, her loyalty to her friends comes first as seen when she decided to give up her agreed Beli1,000,000,000 deal with Igaram for protecting Vivi for the latter's sake after Baroque Works was beaten (although she was upset about it and complained later), as well as willingly giving treasure to Lola and preparing to spend Beli200,000,000 worth of treasure (which they stole from Thriller Bark) to rescue Keimi from slavery.
Information Source: One Piece Wiki