刚看到citi的refer是lifetime的，每个人最多refer 20次，每次bonus根据账户等级变化100-500刀不等，并不是上限2000刀，而是lifetime refer 20次？爆亏80%？
Member Get Member is a Citi® referral program that allows current Citibank consumer checking and savings customers to earn a cash bonus for each eligible Citibank consumer checking account they refer, up to twenty lifetime referrals. Both you and the new clients can receive a cash incentive. To learn more visit your local branch or contact us.
Your Member Get Member cash bonus is based on your banking relationship and ranges from $100 to $500 per eligible referral, up to twenty referrals over the lifetime of your eligible account relationship. To learn more visit your local branch or contact us.