I have a few accounts for selling and one for buying. While I'd love to think that all sellers are honest the reality is quite different and every once in a while you get a dishonest seller who either doesn't ship/ships late or way waaaay overgrades. I once dealt with a very well known seller who (I won't mention his name here, but you probably will all know who he is just by describing the situation) made an effort to email me personally when I simply returned an item I didn't agree on the grade with. I didn't leave nor threatened leaving a bad feedback, simply returned the item for item not as described. So he emails me through the email associated with the PayPal account and told me he would do the same with my store if I returned the book. I was shocked that he went to that length, assuming he is a well known seller and sells many many books. Since then I seperated my store from my shopping account.