It is best to sell a 1M+ (or so) worth of item at the Gaia Exchange Forum. (GE) It is because of the Marketplace's (MP) closing fee of 2%.
Analyze the equation(s) carefully.
Legend
Let x =
MP Sale PriceLet y =
NET EarningIn this case, x = 1,000,000 and y = 980,000. Therefore, the seller using MP will suffer a
whooping 20,000 Gaia Gold.
Use the Gaia Exchange to sell these valuable items to make you and the customer happy. Let's say you'd sell it for 990,000 in GE, the customer pays lower amount and you receive higher amount compared to MP.