There's only so much you can save, but the amount you can earn is infinite. No matter how much you cut your expenses, you won't be able to live as well as if you had increased income. Focus on increasing your income, but at the same time don't ignore the expenses. This could be the same for business too (my words).

The saying that investing is for the rich is it but rich in itself because the only way to become rich is by investing.

Those are the biggies.