That rather assumes you can live on 25% of your income.
For me 25% of my income would be far below the poverty line and the legal minimum wage. I couldn't live on that even if I moved back in with my parents.
Are most people here really so rich that they can follow this advice and take it in stride?
It's fascinating to read about people like http://earlyretirementextreme.com/ who choose frugality over work
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.