Why are the upgrade prices so high?
why does it cost like 3500 BC to upgrade a ship worth 700BC
If you ask the up upgrade price should be based on the components being upgraded. the 3500 cost could be used to be change the ship into a totally different one
I don't know the exact forumla (but figuring it out shouldn't be too difficult). I assume it sorta Works in the same way it did in Gal Civ 2, in that if you upgrade a ship but you don't replace any components (only adding new ones) then you only have to "pay" for the new ones. This tends to be affordable most of the time.
On the other hand, if you upgrade a ship from scratch, say you just got newly researched weapons and armor, then the upgrade will be substatially more expensive, as you have to pay for every single new component, basicly "Rushing" the ship from a shipyard per se.
Also, if the "Cost" of a component/ship translated into a 1:1 "Rush" deal, there would be barely any incentive to actually manufacture ships, other than the hulls themselves (which you could then upgrade).