My thought is it protects your design. For instance, you could have a GREAT idea, manufacture and market it for a fair price. Without a patent, someone else will make the same exact thing only outsource or originate in China and your out of business. I used to fabricate some parts and sold a lot of them. Sold a set right to the competition, they sent it to China, had it copied, and I mean damn near exact, and sold them in the states for less than what I pay for materials, and they still sell them today.
Are the patents in question "patent pending" or full filed? Patent pending is cheap and only registers the idea for 1 year. Doesn't mean that person or company will even file for the full rights so just keep your eye on it.
Other than that, it wouldn't be fair to try to produce the same exact thing, even if it was your original idea. Perfect it, make it better and use your concept to produce a product that would replace the one that is patented. That's fair game. Within reason, your not allowed to reproduce what is patented. But if GM put a patent on a new intake manifold design for the corvette, would other car manufactures be screwed? No, they just wouldn't be able to manufacture an intake that looks and possibly functions exactly like that one, doesn't mean GM own's the patent for normally aspirated gasoline intakes.