For this to work properly you're gonna have to deal with the hypercrate Exchange.
What i'm about to say is gonna make a bunch of people mad, but the high currency trades, like PVE Sales and expensive itens, are already being trades by hipercrates or boxes. So, to fix this, you need to develop a new category of itens, the "Binds on Trade".
For example, you buy an Hyper Crate from the Cartel Market, it's alreadty bound for 36 hours, but then it's free to trade forever. Make it like this.
Player A buys Hypercrate, after 36 hours he can trade it.
Player B buys hypercrate from player A (or from the GTN) - Hypercrate becomes BOUND.
Player B opens the hypercrate, the individual boxes can be traded after 36 hours
Player C buys the boxes from player B or from the GTN - Bonex becomes BOUND
Player C opens the boxes, the individual itens can be traded after 36 hours
Player D buys the itens from player C - Itens becomes Bound
That's a lock on 4 trades for cartel hypercrates that would affect in nothing the players that want it for the itens but would keep people from using hypercrates as a way to skip the taxes.