Anything should be given the option of being traded. It's not like not having any of these will be a permanent burden to your progress. I don't recall for one second that the Spiral Tailed Helm or that the Spiral Cuirass would have to do with the game's ambiguous plot.
...Retequis...I'm pretty sure we've met before. I remember the name more than vaguely.
Listen, this is probably going to fall on deaf ears, but really. I can understand binding certain things to prevent a bit of cheap behavior, but binding too many things hurts the game's economy. The people who enjoy playing this minigame but aren't interested in the cosmetic reward (like me) should be allowed to sell them.
I have no intention on wearing the masks. I don't like the aesthetic, personally. Other people do. People who aren't experts at bomberman or bomberman-like or can't play the 100+ games it would take to get the item. Why should they suffer? Maybe they like the main game more, and maybe they've build up a large amount of crowns because their skill is in the main game. Maybe they'd just prefer to use what they've gained from their skill.
That's how an economy should work. Both parties using their skills for mutual benefit.
I, the player who is skilled at the minigame, can sell off my masks to the player(s) who are more skilled at building a large income, either through the main game or through auctioning. Both sides win. Instead, you're restricting players.
If the bribe reward turns out to be the mask, and I win, am I truly rewarded? As I said, I won't be using the item. I won't be rewarded at all, or I'll be rewarded with something I can't use. Shouldn't I be able to sell it and make a reward out of it?
I'm not going to try to tell you to end binding completely, that's far from a reality. But can we at least have some things not bound? At least allow the bribe rewards to be unbound. you can keep the token trader things bound, fine, I don't care. But at least let us have our rewards.