Proposed solution for lessening Async market bot problem

Since 0.3.0 announcement, i have been reading on various sites (redddit, x, etc.) how community is concerned about bots being able to circumvent gold cost barrier when purchasing at async market by selling lots of items gained elsewhere (selling items which cost a lot like maps) instead of earning through running maps.

So, i present a solution, if it is possible and simple in reasonable ammount of time:
Make all items that were traded /exchanged hands with other players gain a hidden "traded" tag, and cost only 1 gold piece when sold to vendors.

This would not solve all the problems, but hopefully it would alleviate a lot.