To be bruteally honest, scamming this way is not profitable and just ...stupid. Back in the day when the "trust game" was striving I scammed a few Santa Hats which were only 4mil or so back then...but thats still nothing.
I make at least 100mil a day on RuneScape doing what I do, and I am not scamming individuals. I am not even scamming people that play RuneScape. People who've never heard of this way of scamming do find it hard to believe for obvious reasons, so just hola at me and I'll show you my GP.
I do sell my gold every day, so I will never have more than 400mil usually and sometimes none .. but yeah

.