Ok, and you're Banana Pi's product manager, true?
There exist quite a few different USB-to-SATA bridges. The one you used (Genesys Logic GL830) is the worst known (only 15 MB/s write throughput and 30 MB/s read throughput -- any other bridge exceeds 35 MB/s easily in both directions. Are you able to spot the difference? Are you also able to spot the difference between this horribly low performance and real SATA performance BPi M1/M1+ show: 45MB/s write performance, ~200MB/s read performance and way better random IO. Are you able to get the difference? Do you get the idea that it is just fooling potential customers when you tell them BPi M3 'has a SATA port'?).
Even Genesis Logic has better chipsets available. So why did you chose the worst chip that makes this onboard SATA port so useless and performance so painfully low? That was a simple question. Paired with an assumption that you simply copied Allwinner's reference design and they use GL830 there. And that was the reason I mentioned Xunlong and Cubietech since they use the same shitty chip on OPi Plus, Plus 2 and Cubietruck Plus (a choice nobody understands since why choosing an ultra slow chip when faster are available).
I didn't ask for shipping quantities, I just named two other Allwinner board vendors that also use this unbelievable crappy USB-to-SATA bridge. To ask you the simple question why you chose exactly this chip. Since using a good USB-to-SATA bridge onboard is somewhat ok but why choosing the slowest in the world? That was the simple question you either fail to answer or to understand. Or why don't you answer this simple question?
Apart from that I really fear you're believing the stuff you wrote before...