What I mean is that if you invest at once - you will get 15% bonus! There is no minimum limit! But if you invest 212400 GZB (or 531 ETH) - you will get 35% bonus, and 40% - when u invest 640000 GZB (or 1600 ETH)!
It's true. Each investor will be able to choose the necessary bonus. I think 40% can motivate large investors. After all, the profit from the deposit can justify the contribution.