To be honest, I don't really play that much any longer, as I did e.g. 10 years ago. Today, it's mostly handheld (for the comfy, when having a small child in my home) and quick arcade-sessions on my candycab (30 minutes or so). Still doesn't hold me back from collecting games, as I simply love the media too much, not to care. I enjoy walking in to our apartment, and just take a view at the collection.
Regarding the whole sell-my-collection thing, I've been there once. At a point where I hit the 700 titles, I was suddenly supposed to be "the grown up" at home, when we were about to have our first child. So, I sold my entire collection, every single piece of it. As the first 6 months passed by, I slowly started to collect them all again, of course almost ending up paying double compared to what I sold mine for. Not a single day passes by, where I don't come to think of it with regret.
I would NEVER sell anything ever again. Guess I had to learn the hard way