I suspect there are also people in Elvenar like in WoW that post grossly uneven trades habitually, not to help out people, but to take advantage of people's desperation and/or lack of patience. In WoW, and I think this applies even here, people would post super late night/early morning trades so that when all the fair trades were gone for the night after raiding ( I think this is similar to during Tourneys here ) people would be desperate for mats or in this case goods like silk or crystal. When all the good or fair trades are gone and someone needs them badly enough there will almost always be some unfortunate player who will pay anything to get what they need. So consequently you end up with people taking trades where it's giving 20,000 scrolls for 5,000 crystal ( a situation I see all too often in the trader ). So yeah, It's pretty much greed as someone said and it's as simple as that imo.