Margin Trade Scam
Requires Margin Trading skill: Ability to make potentially risky investments work in your favor. Each level of skill reduces the percentage of ISK placed in market escrow when entering buy orders. (Starting at 100%, down to aprox. 24% at level 5)
This type of scam usually involves around selling Officer Modules via Contract, and at the same time having a Buy Order, buying minimum 2, set up for the exact same Officer Module at a significantly higher price. The trap then is that the character that has the buy order does not have enough ISK in the wallet to fulfill his Buy Order of the Officer Module.
Due to the Margin Trading skill only aprox. 24% of the Escrow is payed, so when someone attempts to fulfill the buy order, the last 76% of the Escrow for the item must be available in the wallet, or the transaction will fail and the Buy Order will disappear.
Note: I apologize for the lack of images, I was not able to find an active scam at this time. this may be because Officer Modules are used for Mutaplasmids which then may be use in some sort of Abyssal Module scam.
March 2020: with the recent patch release this sort of scam is nolonger possible as the Margin Trading skill have be re-named/worked to Advanced Broker Relations and now decrease fee for relisting (modifying) market orders (50 - 75% reduction)