I’m curious as to why the Ethernet card has a clear casing. It may appeal to some tech heads but I’d like it more if it’s casing matched the colour of the other expansion cards.
Costs probably.
The other expansion cards all have the same form factor, which I assume allows FW or a sub-contractor to use the same tooling (largely).
Obviously, that doesn’t go for the Ethernet card, so I imagine them to have the choice: make more expensive tooling for the more difficult to produce Ethernet geometry in aluminium, or just injection mould it from plastic. Also no cheap tooling, but I guess it was easier.
Selling the see through look as a feature is just marketing though 
Agreed. They probably couldn’t use the normal aluminum finish because of cost and the weird shape, and instead of making that card black or white or any other obviously non-matching color, they chose transparent to make at least the geeks happy.
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