This is a quote from the book "On Zero Confirmation Transactions" by Chris Pacia
... actually profit maximizing. The theory outlined above seems to be unduly focused on short run profits and not the overall health of the bitcoin ecosystem which is necessary for maximizing long term profits over the life of their mining investments. Blowing up zero confirmation transactions to the point where retail stores stop accepting Bitcoin, while simultaneously enabling rampant f raud, hardly seems good for the value of your mining operation.

Furthermore, maybe miners (correctly) recognize that the only use case for the replace-by-fee policy is to defraud me...
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