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would decline all payouts and return everything to the reward pool

I don't even know if your language is correct here. Do you mean should, if that's the case, no I don't feel that way.

I think that in order for WHAT YOU ARE DOING to not be considered spam, you need to NOT PROFIT FROM IT

My logic is also that rewards that are downvoted end up being returned to the pool. However, you negate this WHEN YOU ACCEPT REWARDS

Here's the actual logic:

For all downvoters fighting, if you post notices or comments repeatedly on other people's content that is not SPAM, you are spamming. 

For all downvoters fighting, if you profit from SPAM upvotes, you are spamming.