/raises hand
"Hello. My name is Alessa and I am a hoarder."
A good 80% of my library is digital, so that's not going anywhere. And the other 20% just looks so darn pretty on my game shelf. :P
I will admit, I have resold a handful of my Xbox 360 games, and I have another 2 dozen or so sitting aside waiting to go on ebay/craigslist.. but those are only titles that I've already purchased a "replacement copy" for PC, because both of my 360s are fried. Anything I can't 'replace' on Steam will continue to sit on the shelf for forever, despite how seriously unlikely it is that I will buy an Xbone or fix/replace either of my 360s.
As for playing them continuously.. not so much. I have so many games as it is now, that once I feel like I've sufficiently beaten a game it goes back on the shelf. Or if it's in my Steam library, I move it into the "Wrecked" category and uninstall it, to probably never ever touch again.
I have a small handful of series that I like and I'll usually play a few times over before I get bored, or implement self-imposed challenges for future playthroughs - Resident Evil, Zelda, Fallout, etc. But otherwise, once I beat it, I only hold onto physical copies for my collection.
But no, in general, I don't sell or trade my games. Not unless I've replaced it from an obsolete system to a more current one.. Though my physical Resident Evil games aren't going anywhere, even though I've replaced all but ORC from my 360 to Steam.
And after how fucked up my N64 was after letting my cousins borrow it (and how many games went "missing") or how I lost my first 360 to my niece while my sister was borrowing it (and she refused to pay at all for my broken console because "360s just break, it wasn't her fault") I uhh. I don't loan out to friends/family anymore, either. My games will stay in my bedroom for the rest of forever. :v