Finished complete playable games require both artists and programmers working as a team. The bedroom coder can probably make some nice demo's or cool graphics but for a complete game they don't have the time and resources to spend on the project (look at how many companies that make nothing but games and have the resources needed release shit you never wanted to play).
Most retrogamers I have seen just use an emulater and "roms" you dounload on the net for free. These people don't bother with anything non commercial (unless its a hack of a comercial game ported to their system) because they have an almost unlimited supply of free games. The culture has changed so that creating content is not as good as being able to rip somebodu elses content. The world is breeding consumers not inventors.