Pardon me, but I am a bit confused.
So... let's say we were gifted an item or purchased it from a friend without going through the vending market and said item was duplicated? Are we just ass out of 700m+ zeny?
And another thing, you stated we'd be made whole if our items vanished, however.... The Market Has CHANGED!!!! There are items I own that I purchased for 10m that are now worth and being sold for 175m. How can us losing pretty much 155m be considered fair and how on earth do you expect people who made their money from the equipment and costume trade to stick around?!?!
Just take SS or video of your items. Do not trust WP.