Basically it keeps everyone on the up and up. I've seen people use a mod to hold the money in "escrow" until the property was for sale, then everything gets transferred and everyone is happy.
The buyer gives the mod the money. The mod tells you that he has the money. You sell your house. The buyer buys the house. The mod transfers you the money. Everyone wins. Except the mod.
Did this already happen? If you haven't bought the house yet, try to do it with an admin/mod as a middle man. It's safer for you that way.
Also, NEVER sell your house without getting paid first. That's just common sense.
If anyone should get credit, it's all of us. @xDRO started a forum post in reaction to a lack of information involved in a situation you started, and I cried to @G.O.A.T. like a little bitch for verification.
Thanks to @Grandma Gary for leaving his cave to help clear this up as well