Actually, I think devs just try to use the easiest way to help company earn the money.
If your advice doesnt consist any point of profit. They will just ignore it. No matter how good the idea is.
They are lazy to develop huge and huge valueable skins and other special items for players.
I guess they still try to higher the value of gold. Tactic value of course.
If devs willing to developed some really interesting features. The game can extend to the size below 1 gigabyte. To most old smart phones, it's still on the tolenrated range.