Some people permabanned get unbanned, i know this. But some people like Darknis will never get unbanned and have A LOT of items.

Market Squad or whoever selling these items will be able to sink the tc they make from them and who doesnt want to sink tc This may not make a big difference, but i feel like it'll help.
Its like buying from shop because the tc will be sunk and items will be added to circulation.

And this way the one of a kind flames and other rare items that are on accounts permabanned wont be lost forever.

The prices of the items they sell i dont know about. Maybe something more reasonable than shop so they actually get sold.
You could use the item forums or market.

Not sure if this has been suggested already or if the admins have already thought of doing this or not.