They are basically a piece of nostalgia for people. A game room, bar, an add-on for people with fond memories of arcades. These machines are small (fit well at home, especially if you want more than one machine) and are often cheaper than the original arcade cabinets. If you want a single device with more reproducibility, you can create your own cabinet with an emulator. It will cost more money but you can use it more. You can also do “mode” arcade1up machines and do the same thing.