Just as there are an infinite number of ways to serve others, there is no limit on what could be considered money. Beauty is in the eye of the beholder and credibility is subjective. Without material proof, credibility is based on faith, and because this world is a physical illusion (digital hologram), we are saved by faith alone.
There is no limit on what could be considered money, as long as it represents something which has a real value. Sticks and rocks can be used as money, but they have to be backed by something valuable in counterpart, otherwise they are going to be simply sticks and rocks...
Credibility shouldn't be subjective if this world wasn't infested by moral relativism, which leads to illusions and misconceptions. But since we live in a reality of manipulation and deception, we tend to develop subverted conceptions about what is essential, high quality and promising. At same time, what is useless, ephemeral and disposable end gaining more recognization and importance than they should.
However, nothing escapes the test of time. Time is always going on to show us the truth and how mistaken we can be regards stances, opinions and predictions we make.