Originally Posted by SloopJonB
Why would a manufacturer recommend an undersized anchor? It's in their best interests, both financial and reputation-wise to recommend MORE than you really need.
Well, yes and no. They want to make the sale. That means that they want to convince you that their anchors are better than the next guy. If they can sell you on the idea that a 30 lbs. anchor of theirs, which costs $200, is as good as the 40 lbs. anchor of the other kind, which costs $275, then you are more likely to buy their anchor.
So they kind of have paradoxical incentives--both to sell you a bigger anchor, and to convince you that you don't need a bigger anchor.