You are, sort of, saying that what took lots of time, ingenuity, and engineers to design, should be easily reproduced in your garage from spare parts and in your spare time.
You are also, sort of, arguing with people who have been involved in the technical issues of bowling probably since before you were bowling, and have LOTS of experience in the field, and on the forum of the guy who owns MoRich company in the first place. Sure you're gonna catch it for saying that you can easily make machines he sells for a profit.
I'm pretty mechanically inclined, and if given the specs, might be able to create something along the lines of a DeTerminator. I would not, however, tell technically minded people that this machine could be simply, and cheaply, reproduced in my garage with spare parts. It's sort of like telling them they don't know what they're saying/doing, and that they are ripping people off by charging so much for something they could make at home.
They may also have had to use "exotic" materials in the production of some of the parts, i.e. the "rollers", in effort to reduce the friction, and thus the influence, they would have on the spinning ball.
If you are able to reproduce the machine, congratulations, but don't be surprised if it doesn't work just right. Sometimes the homespun stuff works, and sometimes it doesn't.
--------------------
Good transactions list in my profile