Arena Shooters also had extremely high skill ceilings and steep learning curves. Good aim was only a small part of the game. Knowing the map, i.e. where and when power weapons and power ups spawn, controlling both item spawns as well as enemy spawn points; that’s what distinguished a good player from a bad one.
If you wanted to git gud you had to suffer through countless hours of getting destroyed. I don’t know if today’s gamer is still up for that. However, games like Counter-Strike and League of Legends are more popular than ever and those are definitely not easy to get into.
HP EliteDesk 800 G3 go for about 110€ on eBay in my area so they should have similar pricing in the US. Bought three of them and upgraded each one to 32GB of RAM and 1TB of NVME storage. They’re near silent and draw very little power which is perfect for me. I’ve set them up as a Proxmox cluster to host a bunch of VMs for messing around. I wouldn’t recommend them for applications that do video encoding though. Plex for example can bring one of these machines to its knees when you’re dealing with very large 4K Blu-ray rips like I am. In that case I usually just run Plex on my desktop when I need to.