Standard earn rewards are paid "in kind" ie: your rewards will be paid out in the type of cryptocurrency that is earning annual rewards, not US dollars. For example, your eligible BTC balance will receive rewards in BTC.
Earn reward boosts are an extra reward percentage on top of our standard annual rewards. The boost corresponds to the member tier you belong to. Effective January 1st, 2022 Loyalty rewards earned from boosts will now be paid in VGX.