To me it looks like they went to the asian style vig where it keeps the same percent juice up and down the line, like they do in Soccer. So it's not "breaking" so much as it's consistent with how much they charge u at -104 and -300.
I don't know how they make monay - usually better prices after commission than Betfair on Soccer (especially with the dickmove on big bettors) and now crazy prices on Hockey. What next, buying points in NHL as well?