People always seem to overlook the fact that the boxes are a rng gamble. The lite boxes can give 200 but it can also give 50 and you can only get a finite amount per day. The paid boxes have a different range for the rng to hit. As far as the ultra rare items being more frequent it takes time to create content to add to the game. If they were to make the pay boxes drop more frequently people who were searching for then wouldn't have to search as long to find them. I believe the majority of the revenue generated by this game comes from people who have enough disposable income to keep spending or just dont care enough to stop. Catering to those who cannot afford to spend would definitely be a poor decision. Especially when there are people out there willing to spend thousands to place on a hunt.