A big part of open world games is the economy in them, while I think we can all agree that Pay2Win is a bad feature, what about spending in-game currency on player acquired items. Such as an auction house, or maybe you can rent out a shop space with in-game currency so there is not always a guarantee that you will make a profit, forcing players to be more reasonable with their prices.
Some people would prefer an AI run economy or no buying of items at all, but I think it's a needed feature. Agree or disagree?
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If its done right, it can be a great idea. Take an example from the MMORPG Runescape's Grand Exchange. It works as a market that you could leave something there for sale, and you can set the price. This system uses the average prices paid for this item during the last month, and then you can raise or lower the price from there. You could leave the item for sale there, and if someone comes along later looking for that item in the market, and if they are willing to pay the asking price, then your item is sold. I am in no way saying this is a perfect system, but this is a system that works. It has it's flaws, but it has some innovative ideas as well.