Super Metroid for SNES is usually around 30$, and it IS considered a rare game, it did sell quite a bit, but rarity is based on how hard it is to get a game CURRENTLY, and super metroid is hard to get.
Chrono Trigger is also around 30$ at this moment, so the rarity of Super Metroid and Chrono Trigger (and FF3, secret of mana, earthbound) are all equal.
(I own every game i just mentioned o.O)
Also, I didn't buy Super Mario All Stars + because I prefer to play the games on the GBA if i have the ability, Portable gaming = portable for a reason, I can play it wherever I go, somthing I really enjoy.