After speaking with @bulldog1205, I have updated it to this:

• Earn 5% of the end of season glint rewards of all referrals (maximum 100% of referrer's end of season glint rewards)

His rationale for this is that people who refer other players before reaching 10 affiliates still need to earn a little something extra, and this is a nice way to reward users who are active and actively referring new players.