*WN sees the reaction of peoples when trying to get unusuals* must be laughing there 
Haha, definitely I have a positive feeling that I can actually affect you guys for my own work.
Actually, I can make 'whip for winners, carrots for losers' system like overwatch, hearthstone that you can get special, rare items periodically(usually how much gacha you've made). However, I won't because I want rare items to be really rare. Like, when everyone starts to wear unusual items, people will not admire it. I just want to make everyone to admire the one who have it, like tf2 and some other good old games.
Also I think it should because there are selling system and trade system. So you won't just collect'em but can earn coins by selling it or get better items by trading it. That makes me not to make such things.
This is some off-topic but once I read a book about game economy in library, I thought that my gacha systems are pretty bad.
The problem is: you can get so many items easily, not for only unusuals and pets. If you guys keep on gathering items further and further, I think that my webapp data storage won't support more. Maintaining it as small as possible is what really needed for me.
So, I think that TF2 achieved it by limited item gathering & craft. I played it not so long time, but I never felt that my backpack is small because I always crafted items & traded with it for excessive items.
Should I include craft system and limit some of your item gathering? Some might hate it, I know.
I think I'm doing it a little by coin gathering by level up become harder and harder as you level up by exp cap grows.
So, I think as there're so many hat items but not so much other part items, I should limit item gathering except for hat items like current unusuals and pets.
And, you can get some special items I mentioned above by craft system(you can think of TF2's hat craft).
Also, you have chance to have rare unusuals and pets by it. I think it's more sustainable way than current.
How do you guys think about it?
God, my writings in English are so bad. I don't sure my meanings are well delivered.
Can you guys help me with my writings above? As I have English writing assignments this semester?

Just tell me which part is confusing/not understandable if you had any. It really helps me a lot, thanks.