And you could still have them at the same price.

I think the issue is that for these companies, it’s cheaper to only make one SKU that includes the adapter (or sometimes a mini and full adapter) rather than making 2 or 3 separate SKUs. That costs extra money for the separate packaging, branding, registering UPC symbols, etc. and they’re not sure if there’s enough demand for it. And the profit margins on SD cards are razor thin already, so there’s not much room to experiment with stuff like that.

It sucks for the environment.