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If they are taking the rewards, then that is presumably already deemed by the masses to be desirable content, no?

Ah, perhaps you haven't been here for long? Whilst ideally the rewards should be decided by the masses and their voting, there have been and will be bad actors who have a reasonable amount of SP who have voted up their own posts or in concert with others to simply remove rewards. This being nothing to do with general approval. Usually the posts in question are poor. Think two words kind of thing

You will see ;0)