Thats not the same as having a 30 way market and expecting a player to differentiate between -110 and -150.
Your example, Im ok witht them cancelling, but really, how often can a book make such drastic error like that? once a year tops? Build better software if not. And yes, Id prefer them paying out even such a wager and booting whoever bets it. An average joe may think just the other line is bad and my side is ok in yopur example. (its obvious either the -111 or the +13o is off but not which side). But i get them cancelling it.