Like the example I gave for Dell/HP/etc. You can't patent putting a bunch of parts together and making a PC. Anyone can do it. A lot of people do do it all the time, myself included. Dell/HP/etc. makes hundreds of millions every year.
Can you produce your own HHO unit? Yes. Can the masses do it themselves? Yes. Does the average person care how it works or want to make and install it themselves? NO!
Another thing to think about. How hard is it to connect a DVD player or cable box to a TV? How much are they charging to do just that at places like Best Buy? Also something to think about. The last time I checked, it was about $100 to install RAM into a computer. It literally takes less than 5 minutes to do it, but places like Fry's Electronics charge an outrageous amount of money to do it.
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