^
Also cashers could make the money by using boxes on items and sell the results. This way they can make even more money than just selling boxes. We would have many good things that could be bought cheap.
Many cashers that cash and get boxes (that are bind in this scenario) will use them on items to get max. effect and sell the results.
And since many would do this the prices could drop. And 70 cap gets boring after you got all your stuff.