Not sure where you're getting these numbers from. From the fine print:
For Content priced at or below the nominal price of 1.99 Euros (€ 1.99), fixed aggregator billing costs will be calculated at fifty percent (50%) of the purchase price paid for Your Content after all applicable taxes, returns, refunds and bad debt expenses are deducted. For Content priced at or above the nominal price of 2.00 Euros (€ 2.00), but less than or equal to the nominal price of 2.99 Euros (€ 2.99), fixed aggregator billing costs will be calculated at forty-five percent (45%) of the purchase price paid for Your Content after all applicable taxes, returns, refunds and bad debt expenses are deducted. For Content priced at or above the nominal price of 3.00 Euros (€ 3.00), fixed aggregator billing costs will be calculated at forty percent (40%) of the purchase price paid by End-Users after all applicable taxes, returns, refunds and bad debt expenses are deducted.