Fair enough. I mean I'd pay about 200€ a year in electricity to run 3 efficient computers. And my VPS is only 73€ and I never have to pay for replacement parts (SSDs, harddisks) which I had to replace at home. And then they have gigabit network, low latency, a proper IP address, it didn't fail yet so their reliability >99.6% seems to be correct. And that's all way better than what I have at home. So it's a no-brainer to go for that. But your calculation might be different.

I mean ultimately there is no harm in trying. If you have 3 old computers laying around, you might as well try setting up a kubernetes cluster. I think it's going to prove difficult to handle the IP addresses but I'm not an expert on high availability and gaming clients.