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Aren't we able to change campaign at end for free?
When you select a new 'home' campaign, you get an option to switch now for a fee, or free at the end of the campaign. For the locked campaign, all the opposing alliance must already be removed from it before you can get the option to join.
You have to select the new home campaign before it ends, then wait it out. In your screenshot, if would have selected the 2nd option the cost would show 0.