Y'know, sometimes people are just like that. Just ignore them and if someone won't trade with you because you are apparently 'untrustworthy', just show them this.
No problem, stay safe out there.
I'm not too sure. But in theory, there might be an increase as people are educated more and because the rarity system, some items increase in value (such as headdresses). Of course, none of these are hackers are like Fman122. Most of them that has ever graced Jamaa are password crackers.