There may be some truth to the old saying "imitation is the sincerest form of flattery." But you have to copy carefully when it comes to the world of video game emulating.
If you want a reasonably priced arcade-type system for your home, emulator programs are a fun way to bring back old-school games -- so long as you do it legally.
Download an emulator, couple it with a retro game, and you're good to go. You can keep the setup as is or even turn it into a full-scale arcade game.
http://www.cnn.com/2004/TECH/04/07/emulators/index.html