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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Player-to-player trading could be good, so I can show my friend how amazing that new gun I just found in an ancient moon base is. But I don't really like trading on a mass scale, as it is generally in MMOs which have lots of miscellaneous items. In an economy featuring only guns, I don't think it would work. Legendary weapons should be earned, not bought. Blowing an alien to pieces with a weapon you just spent 2 hours fighting through a horde of aliens to get is infinitely more satisfying than doing it with a gun you just payed 70000 glimmer for.