I THINK it’s because so many commercial level cards have riveted brackets. Coupled with the fact that standard brackets weigh less than an ounce or so. And the industry is standardised on internal cards with an external mounting. Fire each form factor. There’s very little deviation in weight. Even the massive ePCI and PCIx board’s brackets are under 1.5 ounces. So figuring the bracket into the value (as Chris has done) is straight forward.
Ultimately because Chris said so.
And just to note as I have pointed out server trays do not count as brackets. Trays with built in brackets are proprietary and only match that manufacturer. And often weigh more than a pound. But there’s too much variation to set an inclusive rate. Trays need to be removed.
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