Because there are Apple certified repair shops selling parts "out the back door" (and sometimes "out the front door" as well) because there is demand. There's a thread right here that the decussion was about the dual CPU tray and one user was cutting another user a deal for just above cost.
If buyers are willing, someone will sell for a profit. Human nature. Psychology 101.... (why else would we have people being sold into slavery, people being killed over precious metals, etc. etc. = Profit).
I agree that there will be some sort of availability through these backdoor channels, but it's not going to be nearly as simple as it was in the past where you could just go to a site like newegg and order it then and there. Not to mention that the process to swap these out is significantly more complicated. I imagine the demand with this time around will be much less.
Of course I know the difference. I'm just trying to encourage people to articulate themselves clearly by feigning misunderstanding.
Saying it is "actually faster" and then a paragraph later saying it is "comparable" is incredibly poor writing.
Eh, I'll just disagree. Thought it was quite clear.