Domainers do. The owner of the-brown-truck.biz doesn't.
So basically you are asking whether we are domainers.
Of course we are trying to make profit,
but not necessarily immediately. We can go to negative
intentionally for a while, hoping to become even more positive than we would otherwise soon.
Positive always : no.
Positive eventually, and most of the time: yes.
Reject some offers when you are negative: possible.
Existence of liquid domains can make us feel we are in positive domain.
You can have 1B debt all your life, but because of cash flow it may not be a problem.
You can live a luxury life, and everyone would think you are rich,
but while their net worth might be 10K, yours would be -1B, so technically
you are the poorest.