Me too, it's been a lot of years since I bothered with a home lab, but just recently I put NixOS on a triad of Intel NUCs work was throwing away. They're fanless, quiet and decent enough for Linux with their 16GB memory and 8 cores. Way better than a RasberryPi.
Now I can do some experiments I wanted to do, but not use VMs on my laptop. Feels more real when I can see a little stack of servers I can pull the power on. All are running tailscale so I can get to them from anywhere and run some simple tests. Example: I wanted to play with a quorum of FoundationDB nodes and see how things can fail. Also I'll run k3s and do some experimenting with that. Can I use minicube on my laptop? Sure, but this is more fun.
Now I can do some experiments I wanted to do, but not use VMs on my laptop. Feels more real when I can see a little stack of servers I can pull the power on. All are running tailscale so I can get to them from anywhere and run some simple tests. Example: I wanted to play with a quorum of FoundationDB nodes and see how things can fail. Also I'll run k3s and do some experimenting with that. Can I use minicube on my laptop? Sure, but this is more fun.