how about a loyalty boost to the reward for completing the daily missions? every ten daily missions completed adds +1 kobans to your daily mission completion reward thereafter, maxing out at say 50 kobans. every 5 daily missions completed earns a bonus of a random affection gift. After every 50 daily missions completed the bonus affection gift raises in guaranteed minimum rarity (ie after 50 the gift is rare or above, after 100 epic or above, etc)