Option 1: I command you to flap your arms and fly. You cannot and will not do it because it is not possible. My command is not a viable command and will not happen.
Option 2: I command you to buy a G6 plane and fly. You cannot and will not do it not because it is impossible, but because it costs too much. My command is a viable command, but will not happen.
Let me get this straight. One is viable because it is something you cannot do because you are financially unable and the other is not viable because you are physically unable??
What kind of reasoning is this?
If you are unable, you are unable. Who cares about why you are unable. Whether you don't have legs or you can't afford the prosthetic ones- you are still not able to run the marathon.
For me to command you to do it would still be unreasonable since I am not God.