Though how the real estate industry determines whether it gets "optimal" results would be interesting to find out.
Sounds like it's perfect for REA's as it lets the price range condition the vendor.
Vendor: What will I get for my property
REA: Between $230 and $290k
Vendor: (hearing $290k) Put it on the market
It sells for $250k which is within expectations.
Standard method would be to advertise at $275k which might appeal to the vendor but not the buyer. Inexperienced buyers wanting to spend $250k may not attend as they are used to paying for things at the price advertised rather than negotiating.
I believe there is a greater possibility that someone will pay the full asking price if there is a single price as opposed to properties using the price range method as most offers will be toward the lower end of the range as buyers try to get a bargain.
For this reason Perp's comments regarding whether the optimal price has been achieved are probably valid.
Regards
Andrew