NC, you don't understand. Most of these guys want the sewing machine to creep along as slow as is possible. I understand a beginner wanting to slow down a machine that goes 3500 stitches per minute, and you are absolutely right, just putting a smaller pulley on the motor will do that. I also think that at some point, they should want to learn to use the machine the way it was intended, and get away from using training wheels.
No one lives forever, the trick is creating something that will.