Well... here are some tips.
-if you are selling a game tell alittle about it, like the styoryline and stuff, because half the time ive never seen half the games on ebay, so when i see a game that looks interesting i gotta go google it and look it up and crap. and sometimes if there is no info about it I avoid it all together because it really bugs me.
-MAKE SURE your games work. because alot of the time the auctions say the games have been tested blah blah and then when i revcive the game it either BARELY works or doesnt at all. basically they looked at it and judged if it would work or not.
-Kindly email the buyer that you are shipping the item. i know this is hard for power sellers i dont expect them to, but half the time normal sellers dont even inform you on whats going on, and sometimes its annoying because you wait a couple weeks and dont get anything then email the guy and they say "OH, i wasnt sure blah blah blah"
-Be kind and curteous. ive had quite a bit of people selling me stuff and they are total ass wipes...
-DONT OVERCHARGE FOR SHIPPING. most cd cased games cost arond 2-5 dollars to ship, i always see "shippping $10" wich is BS...
well.. thats all i have. feel free to add stuff guys!!