Yeah, it's truely a shame, but we won't be able to buy some military equipment in HoI4. Ever. (I guess, as no money in the game). That's one of the most important very disapointing aspects of the devs path.
It is a very important aspect of the war though (pre-war, but pre-war leads to war, heh

). We should be able to ask for built stuff, ready to ship, and put money on the table or not. Some countries were in the urgent need of military equipment (planes, tanks and ships essentially) and others were pleased to make money by selling part of their own stuff. But the devs choice is to force us to lend-lease or give it for free, once we have enough obsolete equipment to train our units.
But the worst is that the actual development system makes me afraid that no one could mod it one day in a nice way, as game is designed to NOT handle money or equivalent... Even if you raise it, I guess there will be plenty of conflicts with the rest of the game here or there.