eBay

So i just got a random charge for about $8 on my Bofa account and am very confused as to why. There’s no explanation and no messages i’ve received regarding this, has anyone experienced something similar or have any idea why? Thanks! 

So I was looking at the sellers fees on items an they're substantial however with certain categories of items they're bery little or nonexistent (shoes, art etc). What would be the consequences of purposely listing an item in lets say the men's shoes...