Six at the top means:

One draws from the well
Without hindrance.
It is dependable.
Supreme good fortune.


The well is there fore all. No one is forbidden to take water from it. No matter how many come, all find what they need, for the well is dependable. It has a spring and never runs dry. Therefore it is a great blessing to the whole land. The same is true of the really great man, whose inner wealth is inexhaustible; the more that people draw from him, the greater his wealth becomes.