Boundaries vs Opportunities
The two finite resources we all must protect are time and money. Each can vary in amount from person to person, and season of life to the next, but they will surely be exhausted eventually.
Boundaries on your time and money are necessary, without them you will end up exhausted, in debt, or worse. But when an opportunity comes that makes no money, nor has any immediate benefits, it may still be a good idea to grab it.
If you judge every opportunity based on its financial gains, your boundaries may keep you from a breakthrough. What if that pro bono job is seen by the CEO of a billion dollar business? You may not get paid for your work now, but that effort may open significant doors in the future.