I purchased the original GBA SP when it first came out and still have it to this day. I never had a problem being able to see the screen on it. I use it all the time to play all of my GBA, GBC, and GB games.
I don't buy sealed games unless they are the same price as an opened copy. Hell I don't even buy boxed games unless they are the same price as a loose copy since I don't collect boxes. The few sealed games that I had, I opened. I don't see how it being sealed is going to make the game any more valuable. I buy games to play just as much as to collect. If anything I would want to pay less for it since you can't verify if the thing even works. I have opened about 10 sealed Intellivision games and a few Atari 2600 and NES games so far.
Calling Diablo an MMORPG is like calling Call of Duty Black Ops an MMORPG. Black Ops has massive ammounts of players online and it does have a system where you level up but it's still nowhere near an MMORPG. Diablo is and has always been a dungeon crawler or an action RPG. Just because you can play online and there are massive ammounts of players that play the game, doesn't make it an MMO. You can play the game completely solo and never ever ever ever see another player controlled character if you choose not to. To stay on topic, I think it's cool that there will be an auction house with real money. But I will choose to not use it and stick to the seperate auction house for in game gold currency.