If you you use a computer just as a word processors on regular basis than even outdated computers are ok
This kind of audience does not change a graphic card so often, regardless of the price, simply because they are not interested
But you will not make a game for this type of audience with Leadwerks2, UE3 or C4 engine. You will better use Torque Game Builder (the 2d engine of Torque) to make a fast running and good looking 2d casual game then.
I will never see a 3d shooter at the machines of my parents. They simply dont care and dont need latest hardware for that. But they also buy new complete pc hardware from time to time. So it happens that you see much computers capable to play 3d shader games even though they never will do it.
