You’ll ask for more money
There are many reasons that the richer get richer, and one of those has to do with investments. But another has to do with growing confidence in asking for more money. Each time you ask for more money, and get that “Yes,” your confidence in your abilities grows. The more your confidence in your abilities grows, the more you feel justified in asking for even more money next time. Furthermore, once you have an established track record of getting paid X amount, you are justified to ask for at least that. Most companies or clients won’t expect you to take a pay cut from your last job, so once you make more, you’ll continue to ask for more, and be launched into a new category of cost (i.e. what your services cost).