Several things a person should do before selling any second hand item are a) check new price then allow for depreciation subject to replacement cost, some items retain their value even over time while most don't b) ascertain cost of shipping across AUST but if pick up only say so c) state whether fixed price or open to offers d) if more than one item whether sold as a whole or items can be purchased individually
I've noticed several times people advertising second hand items for near new prices I've even have made them aware of it, because people using this site are not dumb(mostly)