Hey Dennis Pachernegg. After the initial token sale, there will be a smart contract in place, continuously issuing additional MANA into the open market. This mechanism is in place to expand the world and allow new users to claim their piece of LAND. See details here.
The proceeds of this continuous sale goes to the Decentraland Foundation. In essence, this is a non-rent-seeking model, where we don’t charge for anything other than the LAND.
Keep in mind, MANA is not necessarily inflationary, since a lot of MANA gets burned to claim LAND every year.