Vanity Rarity

At the auction in the search for rarity, vanity comes after trash, common, legendary, rare. Despite this, many players claim that the rarity of vanity is minimal. It is very important for players to know if this is the case, since luck and reroll play a big role during events!

Therefore, the question to the game developers is: Is the rarity of vanity minimal? Or is it higher than rare, like it's up for auction?

In the game there is no explanation of how the luck and re-roll work. The players have roughly guessed how: https://ibb.co/J7Dzpcp

There may be one mistake. I hope you can help us figure it out