2 - Besides being rarer, I believe the platinum, gold and silver statuses should be more related to potential than to current attributes.
Hello.
I think the potential you mean is similar to my level cap. Each idol almost gets the equal attribute at first, the training maketh the idol. And the rare idol can go farther.(cause they own higher level cap)
That's why I think the experience system is necessary. We don't need to reduce the rare idol's dropping rate. With the experience system, the most difference between normal and rare idols is the level cap. For example, I've trained my first normal idols in years, they should be more powerful than the rare idols from new auditions. Because a level 30 normal idol is usually getting better attributes than a level 1 platinum idol. It's the power of experience. It totally makes sense in reality also.
For now, the problem is we can't train our normal idols well.
You need to drop each of them to each of the rooms, you need to hire lots of coaches. You need to make sure their stamina. You need to make sure you are rich enough. Then you find your idol finally gets the poor 1 point from the dancing room. (The platinum idol: hello?)