Hmmm... I don't even think trading is a good idea. Dropping currency wouldn't be the best idea in my opinion since more scammers would emerge. If you were "hacked", you can say goodbye to all that dough that you put countless hours into eliciting it.
I believe this has been mentioned many times before, and there's always been an issue with scamming raised in the thread. As much as we'd all like it to be implemented, I don't think it's going to happen any time soon.
No... All it will do is just lead to more scamming. More crying from players saying "HALP ADIAM I GET SCMMED 200 DOLLRS!!! I SPNT OURS GTTNG TAT! RFUND NAO OR I HCK GRALL!" Yeah, not going to happen, stick to shells.