How good are the one-dollar agencies?

On the surface, one-dollar agencies (or ODA, pronounced "odour") very good. Considering that one dollar will not buy a bowl of wanton soup, one dollar is chicken feed. Imagine, if you have to submit an application for a work permit, your bus fare to MOM will exceed one dollar.

So is the Employment Agency which charges one dollar a profit-making body or a charitable organisation? Or is it like Robin Hoodlum who robbed the poor to benefit the somewhat rich?