Gold find and magic find only affect enemy drops and bags and chests that use enemy drop loot tables (like MF-affected loot boxes and caches from PvP, WvW and HoT). These produce very little gold. About 25 silver every 100 enemies or so on average. With 50% MF that's little over 37 silver every 100 enemies.
Most notable boosters are: Hero/Gold and Magic Find banners. Spirit Banners. Most Halloween foods/utilites (the MF boost with boons is best if you can sustain them) -Item boosters, celebration boosters, and MF boosters you will get over time, not usually worth the gems. Use the wiki to double check how they stack. Wiki at:Karma: The fastest method to convert your Karma to Gold is to buy Orrian Jewelery Boxes from Karma merchants in Orr. Note that this method took a hefty hit in profits when Karma consumables were nerfed and the prices of lodestones fell. It is a pretty poor conversion rate, and you rely on the relatively rare lodestone drops from the boxes.
In this video, we explain what is the GW2 Halloween Mad King's Labyrinth and how can you make a lot of quick and easy gold from the lab farm, with this GW2 G