Just make it so people can remove their own listing of an item from the marketplace for whatever reason.

Quick edit, There should also be a flat listing fee of like $1,500.

Also new players shouldn't be able to SELL items on the marketplace until they're at least able to post on the forums.

This would be a good feature for several reasons. This would be good for new users who accidentally overprice items, for accidental mistakes such as wrong item or wrong amount of items, and good to be able to negotiate additional items for such and such prices.

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Soul Crusader (296) said
Just make it so people can remove their own listing of an item from the marketplace for whatever reason.

Quick edit, There should also be a flat listing fee of like $1,500.

Also new players shouldn't be able to SELL items on the marketplace until they're at least able to post on the forums.

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Agreed on all points. If users can't post in the forums for 2 days, they shouldn't be allowed to sell items for that period.

Oh whoah, I didn't know there wasn't this feature already! Should be implemented asap.