There are multiple ways you can approach the creation of a domain like Endless Paychecks. You could advertise it as a way for people to continue to get monetary gains through your business. For example, a direct sales company may entice people to gain an endless stream of paychecks through the website.
It can also address the notion of how people are living paycheck to paycheck. From there, you can position your business as the solution that gives them financial freedom. It fits with MLM companies, marketing, and many others.