It is. Allowing international students to study "for free", is generally seen as an investment into getting more highly qualified immigrants as these students m

It is. Allowing international students to study "for free", is generally seen as an investment into getting more highly qualified immigrants as these students may stay in Germany or even if they leave after studying, they will probably retain some contact helping improve international relations. Considering how Germany is developing demographically this is definitely necessary. Also you have to keep in mind that we are talking primarily about fixed costs here. Having a few additional students, won't really change the costs. Apart from that living in Germany they will inevitably pay taxes, they will have to pay for health insurance etc. so at least in part they do indirectly pay for their tuition.