What we can do is make it against policy for a seller to encourage certain types of unsafe payments by putting them in their listing pages. Regarding cash, we allow sellers to say they accept COD and cash for in-person transactions , but not via mail.
It is not good for a buyer or a seller because it clutters the marketplace. Some amount of pricing ensures a higher quality supply.
It is not good for a buyer or a seller because it clutters the marketplace,