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Seems a bit of an archaic process. Do sellers / brokers add 20% to the price in the expectation of receiving an offer 20% below the asking price. A bit of a pointless exercise. I was pleased to read that the buyer rejected the low offer. I don't see the point is going to see a boat, wasting everyone's time, if you can't afford or aren't prepared to pay the asking price. I accept that I hold a minority view, though.
Do you really advertise at the lowest price you would accept?
You should try asking slightly more, you might get it.