I always double purchase items, you could call it careless on my part, but really its as easy as hitting the back button to browse around. I do it a lot, and usually never ask for a refund. I see people double purchase all my items all the time, and i refund it. I dont understand why this isnt fixed. Sure people are careless, but its really ridiculous that it adds +1 to quantity, when that should be added manually.....