free mming for item exchange

Hey, sythers ive recently noticed a lack of MMers in the item exchange section of the runescape black market, so i have decided to MM small item exchange trades for free .
with paypal
the seller gives me the item, the buyer then sends the money and the seller tells me if the money has reached them (both parties providing me with print screens of paypal balances before and after the trade. If all is satisfactory the item goes to the buyer if not then it goes back to the seller. I do not do it simply by word of mouth as the seller may lie and say money has not been recieved and take money+the item. I don't mind using team viewer.
Membership Pins
the seller once again gives me the item to hold, the buyer then applies the pin via teamviewer etc. providing me with screenshots etc. if all is satisfactory the item is moved on if not it is returned.
I only deal with item exchange as account sales etc. can get abit sticky :/ hope i can be of assistance