The quality as well as quantity have equal importance. In hub page, we appear in front of thousands, not physically but as hub writers. Our personality, our approach, knowledge, our reading and such all will mostly resemble in our hubs.
So presenting our hub subject in good manner is required. Good quality and good quantity will be our Aim.
But it is not an easy thing. Only by writing...writing..hub, reading ...reading..hub, we can reach to make good quality hub.
Quantity of hub, I thing help to earn more. So write as much as we can. And try to develop quality. I think so.