this could be good and bad.
the good: for us collectors, its great since its easier to find out how much its worth sealed. digital press has a database for all things used games, but not sealed. ebay is where you can track all of these prices.
the bad: developers and publishers will not like any of this and i can assure you that. for them, games are meant to be played and not to be kept sealed. why? word of mouth is a powerful thing. if gamer A meets gamer B and tells him that a certain game is good, then he might end up buying it. count as a sale. think of it as the movies. if youre unsure about a movie, you ask a friend if they've seen it. reviews are good but its still better to have hands on experience. this could also take a bad turn and turn everyone into a day trader. where people just want to make extra money on the side by either buying 1 or massive amounts of the game.
take for instance the Wii console situation where nintendo is obviously controlling inventory. see here (http://www.joystiq.com/2007/12/14/notes-from-reggies-wii-shortages-conference-call/). last week there were 19,000 Wii consoles on ebay alone. if the majority of the people are for it to be played, then thats great! but i think more than half of the stock went into either ebay or amazon or even craigslist. its not that im against that, heck i just sold a wii myself last night! but my real concern is that if people could find out that X game goes for say, $90 on ebay and you could still find them in stores for retail price then the situation could turn into the Wii where instead of making nearly double or more of what you paid for you end up with a so-so amount. if people are to maximize their profits for selling a certain game on ebay, then they should sell at the right moment.
but maybe i'm thinking more into it that i should. but theres certainly more to it without any doubt. do i like the idea? yes and no for the reasons i stated. but good luck with the list nontheless