Not that i am a low baller but I am very disgusted by people who use very rude statements in their advert to prevent low ballers from contacting them. This should how uncivilised a person is. I mean you don't have to stoop to the level of the low ballers right? When I see such adverts I become very turned off and probably won't want to contact the seller even though I could match the price.
There are also sellers who quoted strange enough high price hoping to rip people off. Their selling price for a very used product sometimes is as good as a new set. E.g. just a few months ago I saw people selling >1yr old sigma 17-50 os for around 550? They reasoned that they bought close to $1000 previously. But who cares?