If this game is widely sold it won't be worth anything so why are some people buying 2 copies? If it was only sold at one retailer or through Nintendo's website then it might actually be rare but this won't be. I'll wait for a price drop.
There's always a minor boost in value right after the game goes OOP. It could be an easy way to make $10. Nintendo games are usually the least likely games to see a price drop, especially if it's a limited print run. Zelda still has a MSRP of $50 four years after it came out.
How the is this the 25th anniversary of Mario? Super Mario Bros. 1, perhaps, but Mario Bros. and Donkey Kong were out well before 1985...1981 or around there. Too lazy to go look it up.
That's right, it's a SMB anniversary, not a Jump-man anniversary.