Reducing your spending helps in more than one way, not only are you saving more now, but you don't need to save as much.
Lets try an example,
Person A gets only $40,000/year, but he only spends $20,000/year and saves the other $20,000
Person B gets $100,000/year, spends $80,000/year, and saves the same $20,000/year
Person A saves up enough money to live off of after 17 years of work, since he only needs $20,000/year
Person B saves up enough money to live off of after 37 years of work, since he needs $80,000/year
I would much rather only have to work 17 years.
Ideally, you can combine the 2, make $100,000 and only spend $20,000, then you can retire after a mere 5.5 years.