Okay, so i don't plan on buying cartel coins unless i absolutely have to.
But i've found something, i'm able to click on the "Buy Now" even with 0 Cartel Coins in my "wallet". Not tried actually buying & retrieving an item since it might be kinda abusing. There isn't even an exclamation mark (!) next to the Buy Now button, which would be there if i couldn't afford an item.
And it pops up randomly saying "Cartel Coins have been added to your account!", even though my billing day is two days away, kinda annoying
Not sure if it's exploitable, but a hotfix might be needed asap.