I too am an SBC hoarder. It has gotten bad. :D
I bought the original Raspberry Pi 2b as part of a homebrew NAS. Later I bought the Pi 3, Pi 4, Pi Compute 4 + board, Pi 5, 2 RISC-V boards, and a bunch of other boards. I don't have a need for them, I just enjoy collecting them.
Currently the only one I'm using is a Pi 5.