The core objective of the referral model is to allow for low liquidity providers as well as protocols to earn $CRV, $CVX and $XBE, even if it means they deploy $0 worth of liquidity. It allows for people and protocols to create referral codes that they can use to distribute amongst communities, their treasury, and even other protocols.
By helping users generate rewards from simply referring new users to XBE, we expand the protocol's reach, and ensure that new members can start earning without having any liquidity - just by registering someone using your referral link.