No, Ive never worked for Gamestop, and nor has my family. I buy drop shipments, and buy and sell.
My system isnt to part things out. I keep artwork and manuals separate until I get a set, and then I will put them in a case. If I come across the game, then I make it a complete game.
As far as the console boxes, and manuals, it is smarter to piece them out. People throw away one or the other, very rarely both so they sell faster, and you'd be surprised how much they sell for.
And you'd be surprised on the sales I make, you can say small value items, but my entire inventory is retail priced at approximately $15,500 on the low side, and it is a constant flow. Right now I average sales over $2000 a month which is what led me to wanting to open an online store. I know it isn't feasible to open an actual location because my income to expense ratio would narrow too much to maintain a successful business, so online is the best option and provides for a worldwide customer pool.
Owner of The Noob Gamer - Launching Soon
Xbox 360 Gamertag OIF0910Killa