Are tou serious? Tiger goes out of its way, as does Jetstar to a large degree, to care about the customer's money as opposed to the customer, and make the distinction obvious.
Both companies have cynical policies in place to maximise looting the passengers wallet, but when flights are delayed or cancelled treat them with disdain.
The market is only so large here; you can't piss off a chunk of your customer pool at every opportunity.
I actually paid retail for a Tiger flight once. I still feel used and soiled by the experience.
Fare wars are only good for revealing how deep a carrier's pockets are-they don't expand the market permanently, they do not create brand loyalty, they create the expectation that any normal fare is unfair.
When a carrier stretches its resources to engage in a fare war you end up paying the customer to demonstrate what a crap airline you are. Great strategy.