It is written in the whitepaper that half the tokens will be deleted and the remaining half will be resold. "Eidoo tokens will be erased by one half and the other half resold to cover the operational costs. Then the token will initially serve to make cash. When the exchange starts, some operations can only be done with tokens. When you do an operation, half of the used tokens will be burned while the other half will be used to cover the costs. If you keep the tokens in fact you do not go to burn the tokens while the others who will use the exchange will. This will actually increase the price-to-token in the long run.