You're essentially complaining that you have to make high-quality posts in order to participate in signature campaigns.

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If you want to talk about unfair, think about the Hero Members that have created high-quality posts in the past yet are now bummed out of Legendary status because they're 500 merits away.

If you want to point out the Legendary members with shitty posts then I would recommend you to do so. Otherwise, sufficient action cannot be taken against them.