I sent an email to Pointbet to ask them if the Yankees @ -139 was a "bad line" and if my bet would get cancelled. (The outright market for the World Series had been closed at that time, btw.) Here's their answer:
"Dear Sir, thank you for your email.
the prices is not wrong or "bad line". Because everytime after they the
match play the Outright bet type for Baseball will be closed. We will open
the market after The Odds Maker Department analyze the game and the market.
The prize can be same or can be different. We can´t cancel your bet because
there isn´t any mistake with your stake.
Regards,
Vivian Kwan
Customer Service"
I'm not sure Pointbet realise that they made a mistake yesterday but my bet should be "safe" now, right?