It doesn't make a lot sense, unless there is a special significance between Jesus and the gifts. Let's analyze the gifts and see if maybe we can find a clue to these questions. Also notice that the Golden Altar is related or linked to the use of frankincense. Usually we we think about gold we associate it with it's precious value, and that is true, but in this case it represents something very sacred and spiritual. Think about it.
Most spiritual things are precious.
For one thing there was a significance to the moving star. God doesn't move a star only to astonish people. Furthermore, only inspired people saw it and this is also the same for those who find Jesus. Only those who sincerely want to have God in their lives will see Jesus for who He really is. Also, the three wise men had a mission to fulfill.