I think Prigozhin is aiming for a position where he will need the support of a lot of people in order to get what he wants, even if succeeds with his objective. He is rallying support outside of Wagner, in order to gain legitimacy or acceptance for his end goal, whatever that may be.
I have a big enough house to be able to put this machine somewhere out of the way but there are plenty of cheap server gear on classifieds. I paid ish 300 euros for a 32 core machine with 40gb ram. I can host all the things without it even breaking a sweat.
Probably uses a lot more electricity, but I haven’t really noticed it on my power bill