That would be absolutely true in a conventional airline Bum. However, more than half of Ryanair's pilots are contractors. If they go on strike Ryanair will only start to lose out on the money if they can't muster the staff to man all their flights.
For that to happen you'd need a very large number of pilots willing to go on strike. The chances of getting to such a number without any form of union or proper organisation is rather slim.