Right you are! And that's a point I didn't want to press, but will now. Anyone buying a Sigma Art lens from Massdrop is probably not a Pro photographer and certainly not an early adopter of the ART product line (35s and 50s are older lenses now). If you're buying either of those lenses on MD, a) you missed the bus, and b) you haven't been following along with mainstream photography resources most photographers follow daily. Not trying to sound snobby--I'm in the same boat with many of the Audiophile products I'm learning about here on MD--lots of guys know more about that category than I do, and I'm pleased to be learning from them.
Back to the topic, what Jason doesn't have control over is the length of time it takes for MD to generate enough buyer commitments for a given manufacturer to commit their resources to. A manufacturer can say, I'll commit when you have 3,000 committed buyers, but who knows how long that will take? And then comes the build and ship time (Zzzz...zzz) it takes to fulfill the final order.