On that case thing: I have a first batch(so says the label) that I got second hand. It came with some reinforcing having been done to the hind by the previous owner, 1 crack by the right speaker, & some rough bits on the edges where the two pieces of the case meet. I've dropped the thing 3 times since I've had it. It's still in just as about as good as shape as when I got it.
The only issue I have with the nubs is purely software. When an emulator messes up & crashes, it doesn't reset the control setup for them back to the mouse configuration. That takes like 5 seconds to go into the menu with the stylus or keyboard & redo those settings.
As a second hand owner though, I have no idea what sort of hell the others went through though. I don't know what y'all have been through, nor do I know what to say on that. What I do know is the one I've got came from the worst generation of Pandoras &, by the time it got to me, whatever serious problems it may have had were taken care of. The only issue I've had is that I had to fix the DC input jack twice and I'm holding off on putting it back together til I've found a way to secure that better. It's a pain, but no worse than the various laptops I've had to do that to for friends.
All in all. It's not a scam, because that's deliberate fraud for the sake of cheating people. Instead, it's an attempt at making something by people with the best of intentions, not enough business experience, and worse luck than someone personally cursed by God.