Press cites average pilot wage bill of 200,000 euro per year for 650 flying hours.
The strike cripples their transfer traffic to South America from Heathrow (which is substantial) because they won´t offer the usual prices with the short haul leg on BA - and if you book Iberia right through they won´t rebook you on BA when the strike schedule is announced and your Iberia flight is cancelled.
Guess how I discovered this?