Apart from some grammatical error in the second sentence making an exact meaning uncertain, MU is of course a value that MA factors in, because it can create demand which people will trade/spend peds for, but which has much less 'value' if tt-ed and at some point withdrawn to real money.
When I write 'factors in' I mean it has an important function in game that MA is well aware of. It appears that approx. 75% of the boxes' tt value is ammo, which has to be cycled, for most people at a loss against MA. But the attractive part for the players is of course the use and mu of items that are in the boxes too.
I think most people know that it is other players you must provide something useful for when you want break even or even profit here.... I think that most of the stuff that can be sold from the boxes will be sold (in order to find the players who value each particular item the most for their play styles...).
As I said, not sure where you are directing the blindness at, but most people are blinder towards the long-term end of the road than the short-term bit of it