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Rules should really be strictly followed and its been stated before the campaign start.If its been said to equip signature until the end the campaign then you should follow it.
Bounty hunters who have been jumping from one bounty to another bounty thinks of it as unfair rule. But they have to respect the rules of that bounty and if they don't like it, very simple and the answer is by not joining from the start.
Decision would vary with the manager if he would consider out to count stakes for those who leave and plan to join other campaigns but most of the time the dont really grant such request.
Yes, I've said this too if the manager is very considerate they are lucky if they found a manager that has that attitude.