Just as in the real world we don't spend most time fighting between each other or some monsters, it would be nice to have a MMO that focuses mostly on economic activities. By that I mean producing goods services and trading.
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It's only fun to make money on say world of warcraft because most people aren't also doing that. (but instead buy your goods and use them for something essentially unproductive in economy-terms) Even then it can feel pretty stupid given the amount of arbitrage bots people have set up, you have to focus on very niche opportunities or oversights by those arbitrage bots. Kinda like the real economy