Class struggle among friends?

I go to the street festival in Eisenbahnstraße, a district of Leipzig full of international cultural things due to a number of migrants from different regions of the planet living there. Most noticeable to me appeared to be Turkish and Russian people who can be recognized by their language. Also there's a lot of cafés there with all that south European and Asian cuisine. Besides, there’s also a lot of what many people would still call alternative ways of living. One of these is the house project Schöner Hausen which my roommate David is involved into. The idea is as following: a group of people buy a row of as many as four frayed houses in quite a shabby condition for a relatively low price. They renovate them then, and that’s what they need money for. They’re looking for non lucratively inclined ways of financing their project, like Direktkredit and StiftungsKredit.

As one of the participants of the project explained to me, they just want a safe place to live. By safe she meant the housing to rent where you are not regularly required to pay a bit more, and a little more, and then yet more. As far as I understand how it works in Germany, when the house owner wants to raise the rent there’s no legal way to stop them from doing so, even if it comes directly to protecting your family budget against drying up, followed by the necessity to look for another place to live. She particularly thinks, one of the reasons why the house owner might sometimes decide to raise the rent is because there appear richer people with better payment capacities. She made clear that, "We want no rich people here.»

As I was thinking about it later I realized I was a bit in double thoughts concerning what I saw and heard. I’m totally for the idea of bringing your living conditions to a more sustainable state, also keeping in mind that this requires a lot of responsibility, involvement, activity, and development of many social and practical skills. I see it as one of reasonable ways to get to solve the problem on a smaller scale, which is, for you, a bunch of your friends and children while they’re staying with you. And still, what I heard was, if some of my richer friends would like to come over and live here I’d have to be against that because it would probably bring about increasing of my flat rent. Is this meant to be a class struggle among friends?

Other ideas come, like a possibility of having laws that would restrain house owners from unreasonable increasing the rent; methods to define whether the increase is reasonable or based on pure greed. And also, a rhetorical question arises, whether it can ever be enough for people, whether people can ever stop wanting more...

If people could stop wanting more, there wouldn’t have been a problem to solve in the first place, and people would be able to deal with other issues like burning less coal to ensure safety at a bigger scale than struggling against (other) people's cash appetite.