Drivers that prioritize accuracy, and ECC ram fall well within the realm of "lower threshold for error", and price discrimination is covered by my parenthetical.
That said, the reason that custom SoCs are often less expensive than mass market cards is just because they have fewer things on them. If you don't need an FPU (which you obviously do here, but as an example), you can leave it off, which saves silicon and saves money. General purpose cards needs general purpose things, but a custom chip can often leave out certain components, although I don't know which ones those might be in this case.
Drivers that prioritize accuracy, and ECC ram fall well within the realm of "lower threshold for error", and price discrimination is covered by my parenthetical.
That said, the reason that custom SoCs are often less expensive than mass market cards is just because they have fewer things on them. If you don't need an FPU (which you obviously do here, but as an example), you can leave it off, which saves silicon and saves money. General purpose cards needs general purpose things, but a custom chip can often leave out certain components, although I don't know which ones those might be in this case.