I don't any benefit for anything I do personally or commercially outside whatever people paid me initially. Why should you get a monopoly on an idea because you were lucky enough to think of it first? And in a country where monopolies are banned due to negative impact on society in about every other field? So I'm against the monopolies to begin with.

Even if we accept patents, then you can be required to partner with a manufacturer within a certain period of time. This kind of thing might already exist if we compare it to the record labels for turning copywritten songs into fortunes for labels and authors. Similar middle-men would show up plus DIY kits, consultants, and advice on doing it yourself. The risks you face wouldn't be much different from the current market where trolls like Intellectual Ventures convince broke patent holders to give it to them for pennies using pressure of their bargaining power then make millions off them in law suits.