The question, then, is is it acceptable to have an overwing exit that cannot be opened by said crew in the crush of an evacuation 'cos having opened 'their' exit they will not get across the aisle to the other. All for the sake of trying to 'grab' money off the punters.
It seems to me that if an 'overwing' row remains empty ('un-bought') at boarding the 'dosh' is lost anyway, so why not move an AB there in the interests of, heaven forbid, passenger and crew safety rather than profit?