The problem is that manufacturing, services, and agriculture are already accounted for in the population.
As has been mentioned, wealth is a rather peculiar concept in Aurora and to some extent merely serves as another means to impose limitations when constructing things.
As a result, it became necessary to somehow generate wealth, especially in VB6 where bankruptcy could occur quite rapidly.
While I would appreciate wealth playing a more significant role in the game, I believe we are approaching the point where it could be considered obsolete.
Moving on to the naming issue, when placed in context, there isn't much remaining to rename these buildings. Many games utilize tax collection centres to emphasize their function in collecting revenue; others associate this with administrative roles, meaning more administration buildings lead to more efficient tax collection and reduced corruption.