Talk:Imperial upgrades/@comment-173.28.63.240-20151013001740

The Special Investments increase your empires land, and they are limited by the number of Included Systems (which also counts the players system), so that upgrade for the Included Systems is already their. I can see a small amount of reasoning regarding not being able to invest in them though, as if you have an Included System that is just barely included and you suddenly do some heavy investments in something that decreases your Core Wealth that aren't Identity, Joy, or Availability the decrease in Culture can cause the system to go back to being a Connected System instead.

I did a reply to the Science upgrades request page and made mention of a 'Core Systems' tech. One of the benefits of the Core Systems is that they can't ever have the status rescinded, it is permament once they have it, so they would be more practical to do upgrades to, or have your scientific upgrades benefit them as well.