I don't understand how the price of items can go from 90m to 990b in one jump.
That is a LUDICROUS jump. This seems to be the main con lately with a game like this. They make the entry level quite easy to attain, and once you get to a certain level now it becomes unstainable. This will likely include a p2w service at some point, I guarantee.
I don't get why people can't just make a somewhat logical game that is rewarding and enjoyable. People WILL buy that sort of game. People will not buy a game where 1 item jumps from 90m to 990b. That is pure stupidity.
Also regarding any game of similar fashion. It needs a solid off-line earning system. This game does *NOT* give that. Yes, you do get some bonus. But lets be honest, the game really requires you to actively play it for 100+ hours straight fully online the whole time.