Oy Ninja. I don't agree with everything in your first post.
First, Vasari economy is very good. What throws people off is that it's a resource focus, not a credit focus. You get more resources as vasari. When necessary, you trade resources away for credits.
Second, Advent economy may be decent, but it's the worst in the game. Advent cannot upgrade their income of credits from tradeports, they don't get good extractors, although they can switch trade ports to a resource focus.
Last, I wouldn't call Advent ships weak individually. When you go in and take into account the number of ship slots per unit and cost of unit, Advent, TEC, and Vasari ships actually compare extremely well. What's exploited by an Advent player is the support abilities he can get for his ships, such as shield regen, malice, the aura from a halcyon, or the guardian shields.
Other than that, dead on man, dead on.