I'm glad to see some good debate over this at least
It's a big change to the way things are done now. It affects the entire economic structure of the game and we would probably need to make other changes to accommodate a market and/or auction. I think the main effects of doing something like this are:
1. It offers players something to do besides what they do now, which most of us agree is stale.
2. It gives players a new way to interact besides Attack Trader (3) and ingame messages
3. There would be more focus on acquiring personal wealth in the game. Players could make a decent amount of cash by buying and selling weapons and other items on the market.
4. This would increase the money in circulation, so we would need to think of interesting ways for players to spend the money.
5. It would mean that good players might have Nukes, and Alskants might have CBDs which goes against the established rules up to this point, but consider that they will have paid high prices for those guns, and when they pod they lose it all.
It would not take away the need for Peace or War, because Peace/War would still affect weapons buying. Peace and War would affect the market and the game. We have talked about changing how politics work as well, so it might make sense to think about that too.