I don't really like losing my colonies and forts either, but at the same time, I love absorbing my enemy's stuff!
I have used the colony only once so far, and it was because I had just invaded an enemy's city (and the border shrinks right up after a takeover) and needed the uranium that was just outside the border. I built the colony and got my uranium.
Unfortunately, the AI knows the importance of a uranium colony. So I lost it soon afterwards.
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