So I just started as a vendor and I have already started noticing this.
A "Vendor" will put up an ad for the same product another vendor has but a higher price, then they will get the address, send it to the other vendor with the lower price and use him as the shipper. They do this so they do not get in any sort of trouble as they are not sending illegal substances through the mail, and they can make some easy coin.
If you see multiple addresses coming in from the same user, in a short time frame, blacklist him.
I know, it may sound like "WELL I STILL GET PAID" but you're letting someone else profit on YOUR risk. If you get caught, you go to jail for a long while. If he gets caught, he has no record of actually selling or receiving illegal substances.
Be careful out there.
who gives a fuck