just want to underline the fact that the example you provide, wasn't fitting properly in the topic discussed.
We're apparently running two different discussions😉 Do these obvious situations as you mentioned still really happen that we need additional system's preventing solutions? Do GM's really aren't able to catch such kind of hugly overpaid transfers and even restore money on newbies accounts. Simple solution. Do we really need to implement so complicated, unnatural (btw newbies would be lost in this rules for sure) and destroying the market solutions?