If you open source a product idea that doesnt stop a big company from mass producing it. In fact, it gives them a license to do it. Lets face it, if Berkley or some other big company makes the same thing we do, they will out produce us on every plane. (Quality, price point, speed to market, etc. etc. etc.)
If you hold a patent and need to go after someone, the negligent company would eventually have to give you all profits made on the item and cease production. However, they could play the game of tying you up in court until your money ran out. If it were me, I would only apply if I planned to mass produce it myself. If your plan is only to sell your design to them, then just make them sign a Non-Disclosure Agreement. That allows you to show it to them and they wont be able to steal it. Save your bucks and shop around for a buyer.
I am named as an inventor on a few US patents. I also have a few applications pending. (These are employer sponsored)
Great idea btw
Sonny