Simply nobody. You are right. Who tell you real buyers are real mediators and they will start searching for someone who may buy after they contacted you. At end nothing will happens. I hold 18" RP. Its a big vessle. Tried to sell for 3 years for little money, but I just met stupid chain of mediators (sometimes the chain was more than 25 members). Everybody introduced us as "we are direct buyers / we are direct reps of buyers". Somebody told me that they have lisences (just fake and some are jobwork contractors of those govt companies only). I now happy after I forgotten contacting people. Item point of view, it will loose its power oneday. I can use it to make my herbal tea everymorning lol.