I don't understand it and will personally not buy a sealed game unless I get it for a good deal and can either turn around and sell it for a profit or open it up and play it. I have been building my collection lately but everything I own works and is meant to be played. I have friends come over for "retro night" where all we play are the retro consoles and games and don't touch the new consoles or computers.
I do have a larger collection than I could honestly play through but part of that is I buy in bulk when I can save a ton of money plus I enjoy having my brother's kids over and seeming them get excited when they see all the games and know they can play any one of them they want. They seem to enjoy the raw selection of games over the games themselves.