Dive Insight:Members of each Starbucks rewards tier have access as well to successively better rewards, including increased double points days and longer redemption periods for birthday items. Starbucks is updating its rewards system How benefits differ by tier in Starbucks Rewards new structure. Under the old system, Starbucks Rewards members receive one Star per dollar spent. This is roughly a 3.3% discount, compared to the spend required to amass that many points by Green tier members. Cava added points-based membership tiers to its rewards program in October.