About VIP tiers and how to get lower cost

Plan	Explanation	Applied condition
Tier: VIP 1 (Gold)	Base cost is Tier Price – Vip 1	Unconditional
Tier: VIP 2 (Diamond)	Base cost is reduced by 0.25 USD per unit compared to Gold	Seller has sold out over 500 units. Diamond price is from the 501st sold unit.
Tier: VIP 3 (Platinum)	Base cost is reduced by 0.5 USD per unit compared to Gold	Seller has sold out over 1500 units. Platinum price is from 1501th unit sold.