No one can be good for long if goodness is not in demand.
Also:
The aim of science is not to open the door to infinite wisdom, but to set some limit on infinite error.
I think the Brecht quote is somewhat misleading. The problem is not that not enough people want/demand goodness, the problem is that it is too easy to profit by cheating without getting caught.
Another monthly installment of the rationality quotes thread. The usual rules apply: