If they had 14TH/s S9's, why is the Jan 11-20,2018 batch 13.5TH/s?  Should I just wait for the next batch?  It doesn't seem like this one is selling out as quickly as others have described previous batches of the S9.  Somewhere in the 249 pages of this thread, I read that one batch sold out in hours.

If you're able to remove the boards, can't they just be replaced with new ones?  Does anyone sell them?  Are they super expensive?  I'm looking into buying a couple of S9's, but all of the problems I keep reading about scare me.  Not to mention the complaints that Bitmain is horrible at customer service.