While the maximum discount is Rs. 2,500, at times you may see a discount lesser than this amount as it is dynamically calculated based on factors like the flight chosen, travel distance, day of departure, standard / normal fare available based on revenue management, etc.
In other words, near zero actual availability of discount as advertised.
A very common tactic used by so many others too. Nothing to get excited or bothered over.
Nothing to see here folks... Move along.