Reward redemptions are dependent on the program type selection.
With standard loyalty enabled, the reward values are a fixed calculation of award dollar value times points needed for one dollar redemption, ie $5 × 500 = 2500.
When custom loyalty is enabled you can set the individual redemption values per reward level, allowing you to maked tiered rewards that offer more value for bigger rewards.
In both cases the total customer purchase value will be updated to reflect how much the customer will need to spend in your store, excluding bonus offers, to qualify for the rewards.