Not quite the full story. The durability of chrome depends on the hardness of the base metal, therefore, chrome is not generally used on aluminum, softer grades of brass, or copper. If the base metal is dented, the chrome begins to flake, which is why you most commonly see zamak oxidation on the threads of posts, and around the bases of the posts, or on the corners of baseplates- these are the areas that bear more stress and flex more, in use, pulling the chrome away from the zamak.
I'm a know anti-zamaker. My main issue is paying a price that is incredibly over inflated for the materials and production cost. The molds in use have been around for 70+ years, and have been paid for hundreds of times over, yet Merkur still opens at the $80-100 mark.
However, if you like the feel and style, it is certainly cheaper than most stainless offerings.
All true, and for our further edification (plating substrate hardness and ductility aside) - as a point of reference, Zamak (an alloy of zinc, aluminum, magnesium and copper) is mostly zinc, with a Brinell (HB) hardness of 80 to 100-ish, depending on the alloy (316 stainless steel is 149, chrome plating is 197):