I don't know if I'm alone here, but I've worked my way through about a dozen DE blades, and consistently find the second shave to be much smoother and about as sharp, as the first.
This is especially true with what I consider to be the sharper blades - Feather, Bic etc.
Is this because the manufacturing process leaves a rough burr on the edge which my face takes care of during the initial shave?
If so, I want some volunteer with a really heavy beard to come forward.
I'll send him all my blades - he'll shave once and then mail them back to me.
I have several hundred blades, and will probably buy more.
My new buddy won't have to buy blades for a very long time.
Or, I may have to enlist my wife and daughters to do something I've always forbidden then to do with my razors ..........