This event seems to be doing a good job in combating the gold influx.

Maybe all PVE events should be like this (for those hardcore grinders). And PL could maybe put together seasonal updates (e.g. Halloween events, vanities, etc.) & a decreased threshold in a PVE event that is seasonal as well (e.g. Halloween - farm suggestions as one said 'devil's pitchfork' from the mad mage). A once-in-a-while gold influx orientated around seasonal events is something that would seem reasonable.