It is something like safe deal, it is a good idea, but I think there will be some minuses and arrive more scammers, not sellers, but buyers, that will get their product, it will be delivered but they will still hold coins and may use, as example, button "not delivered". Yes, of course this garant service will be good, if it will be, but just imagine how many people that now are using carding will level up?)
Think about that