Expel Minorities Isn't Free with Tier 3 Gov Reform

[Cavalstone]

Under Tier 3 Bureaucracy it says that for Exile Colonial Companies you get +5% Settler Chance and -100% Expel Minorities Cost.

I assumed this meant that if I have two colonists then I can start two colonies (not expelling minorities), recall the colonists (but leave the colonies growing naturally) and then start two new colonies with Expel Minorities and the two latter colonies would have no maintenance costs. The total cost would be 4 ducats per month (2 for each regular colony without a colonist).

Instead my Colonial Maintenance is 14 ducats per month:
1. 2 ducats for a colony w/o a colonist
2. 0 ducats for a colony with a colonist expelling minorities
3. 4 ducats for a colony w/o a colonist
4. 8 ducats for a colony with a colonist expelling minorities

Does this make sense to anyone? Is it a bug?

Please let me know what you think. Thanks.

[grotaclas]

This makes perfect sense:
1. 2 ducats is the normal maintenance without any modifiers
2. the expelling colonist gets -100% maintenance, so it costs 2 * (100%-100%) = 0
3. The first colony over the cap has +100% maintenance so it costs 2 * (100%+100%) = 4
4. The second colony over the cap has +400% maintenance and it is expelling minorities which gives -100%, so it costs 2*(100%+400%-100%)=2*400%=8