Commissionable volume is earned on purchases made by Affiliates and their direct Customers. Commissionable volume is calculated to determine commission payouts for Affiliates. Commissionable volume consists of cards (not including paper upgrades), gifts, and subscriptions that are purchased at variable rates.
Qualifying volume (such as PCV & GV) is comprised of all product and package purchases made by you and your downline organization. You do not earn commissions on this volume, but it helps accomplish qualification requirements for rank advancements. When you advance in rank, you earn more payout for your sales. Much like a promotion would work, each time you promote to the next level you receive an increase in your earnings.
You can review the Compensation Plan Details here.