So it costs 500/600/700... to build a holding and 1200/1800... to upgrade it? This is way to prohibitive; especially when you have Aegon upgrading the red keep twice when he first lands and then building and upgrading Kings Landing and other holdings in a 9 year space.
Upgrade costs should be more in the line of 500 for level 1, 700 for level 2, 900 for level 3 and so on.
Upgrade costs should be more in the line of 500 for level 1, 700 for level 2, 900 for level 3 and so on.