what runescape scam is this?

this has happened to me twice now..

so i was wearing Sardomin armour and i was in the G.E. and someone came up to me and offered a trade then showed me alot of expensive items worth around 20mil and asked if i wanted. So of course i replied with a yes and they told me to teleport to Lumbridge. When i did they said follow them to the bit where you sail to Daemenheim so i sailed then they said follow and took me to the bit where there is a guard blocking the path to the wilderness who tells you that other players can kill you there and that once you are attacked you cant leave so i didn't go in. The person told me to come in and dropped some Guthix platelegs so i quickly ran in, took them and left..

About 3 days later (today) someone else traded and showed me 36mil she told me again to go lumbridge and sail so i did, this time being extra cautious she made me follow her too.. again, the same gate in the wilderness and then she dropped the 36mil on the floor and left however i thought i saw someone in the distance so i went to the bank, banked all my stuff so i could get it without my armour on. as i did this the person who left the money was there and said the money better not be gone and quicky got there and took the money this time they told me to put my armour back on because it was for a video on youtube and i said give me 6mil first incase something happens to my armour and then you'll have 30mil for the video. she said fine but then went back into the wilderness and said come in here, ill give you 6mil then you bank it and ill give you the rest so i said no and then the person got all vexed and said i was needy and that they hate needy people and then went offline.

what is this scam that people keep attempting to do to me its the same place they keep taking me to..