We are trained since young that we can trade our time for money. You can give up some of your play time and do some chores around the house for extra pocket money to buy that toy you always wanted. This is reinforced as we enter the workforce. An employee is compensated weekly or monthly for their services while a freelancer charges hourly for her work.
Since there is only 24 hours a day and 7 days a week, the most obvious ways to increase your income is to get a higher paying job or to charge more for your products and services.
Ideally, you wouldn't want your income to be limited by the time you spent on your work. You could hire others to help you grow and expand your business.
However, not everyone have the luxury to get others to work for them. Most of us have to do the bulk of the work ourselves. So how do we make this trade worthwhile?
I believe the answer is passion. With passion, you will be willing to sacrifice your personal time to get things done. With passion, the work you do is art. And without passion, whatever you do can and will be replaced by someone or worse, something else in the future.
If you are passionate in what you do, you wouldn't mind trading as much as your time for it. In fact you will make time for it. And with all that passion, I'm sure the result is something others are willing to pay more for.
Don't just trade time for money, trade it for your passion and you wouldn't need to worry about money then.