No—points are not currency. You cannot "pay with points" to cover 100% of a purchase. They convert to discount coupons applied at checkout.
$59.99 new game → Pro 10% off used ($53.99) → 20,000 pts ($20 coupon) → Pay $33.99 + tax. You still pay cash/card for remainder.
Points = discount accelerator, not wallet. Plan redemptions for big used hauls.