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Zero cost txs / near zero cost txs => bring zero-cost abuse or near-zero cost abuse.
When that happens => cost to transact increases to bypass the abuser's queue.
Yup. Just goes to show you that miners don't care about Bitcoin. Otherwise, they wouldn't fill blocks with junk low-fee transactions. It's as if they never heard of rational self-interest, or doing it wrong on purpos.
What we need is some sort of a central authority to continuously adjust the Bitcoin protocol to compensate for such irrational behaviors.