There's another twist to this. I once worked with a company that had developed a little sensor that would let you know if you'd left your infant in the back seat. They ultimately decided not to market it at all; the liability insurance required, should it ever fail, even once, dwarfed the modest profit it would have brought in. I understand LOTS of things don't make it to market, for that very reason. The number one cost in my aluminum ladder isn't aluminum, or transportation, or sales; it's liability insurance. For a damn ladder.