Great Idea but if you are looking for some constructive feedback I would say its gonna be a hard sell when you can get a good stable step ladder for less than $50. These things will be getting ripped off more than Box Anchors at that price. I wouldn't pay more than $199 for something like that if I had a big boat.
Just trying to give an honest opinion, not trying to bag on your product.
Good luck,
OL