[quote name='Doomstink']Plus, re-releases of rare games tend to never come close to the value of their predecessors.
Games that usually become rare are games that:
1. Launch at the end of a consoles life span.
2. Have an incredibly small print run.
3. Have a small, but die-hard fanbase that snowballs into a huge fanbase long after the game releases.
Chrono Trigger has had plenty of time to build a huge fanbase, it had a fairly large print run, and the DS is years from it's grave.
I could always be wrong, though.[/QUOTE]
A couple of examples of games that do not fit your criteria are Tetris DS and FFVII. Of course, one can argue that those games are not rare, merely sought after. Maybe Chrono Trigger DS will eventually follow suit, and will be valuable because it's highly sought after.