Rarity is such an insidious beast... I was at an FYE today and saw a brand new copy of Dokapon for GBA sitting there.
I could buy it for the $35 they want and sell it on eBay for at least a $20 profit, but good lord.... why?! Foisting that mediocre crap on someone to make a profit would feel icky.
That's how I felt while playing Elf Bowling 1&2. It exists simply to con people out of $20.
Sadly, it probably will be rare at some point. It's certainly not as ubiquitous as Ford Racing 3 or Monster Trucks DS. And since Nintendo can recycle DS cards, even overstock can "vanish."
(BTW--if I had my way, Elf Bowling 1&2 would've received a 0.4, but, alas, GameSpot's rating categories go from 1 to 10).