I can see why there is a big gap between the mid tier and high end mounts.
When you look at it, just about everything on a SB mount is either NC milled or machined in some way, and anodised rather than lots of die cast parts with the lumps and bumps hidden behind crinkle paint. The time to machine and the wastage of materials from milling a large but spidery part out of a large and solid block of alloy has to add hugely to the cost.
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