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Any problem with the auction house is supply and demand. People don't undercut for "teh lulz," they undercut because the item isn't selling fast enough for their taste and they lower the price so it...

It is 100% supply and demand.

No one cares about your personal issues, that has nothing to do with the auction house or why people undercut.

As you've been told multiple times before, if you're...

supply and demand.

There is no solution to "trolling" and "undercutting", because these are issues inherent to any free market economy and are entirely caused by supply+demand issues.