like campaign managers remove participants from their campaigns without prior warning so with that there is no loyalty from the participants again. Campaign managers have to respect the participants as well so that there would be mutual friendship so that when a participant want to leave a campaign then the both parties would understand themselves and peaceful exit would take place.
It is hard to take if a member is removed from a campaign that they enjoy advertising, but take note that every campaign manager reserves the right to remove participants without warning or notice and you can find that information in the rules of every campaign thread.
There should be respect from the both sides.
I agree, and i think most managers usually leave notes of warning to participants that they think aren't advertising well and even for some who don't leave notes, they do not just remove members if they have a 'bad' few weeks, but after months and months of really poor posting habits.