Seriously....
FFI
FFII
FFIII
FFIV
FFV
FFVI
FFVII
FFVIII
FFIX
FFX
FFX-2
FFXI
FFXII
FFT
FFTA
FFIII DS
FFMQ
FFI&II PACK
FFIV GBA
FFV GBA
FFVI GBA
FFVII CERBERUS
FFVII ADVENT CHILDREN
FFVII STOP MAKING SPINOFFS WE KNOW IT ROCKS
(Technically) KH
KH CM
KH 2
FFL
FFL2
FFL3
FFA
FFA2
FF MONOPOLY JP
Rumored FFVII Remake
FF CHOCOBO DUNGEON
...And many more
I didn't list all of them, but that's 35 games... I think the word "Final" is pretty damn stupid for a long running series like that. Do the math: If all of the games above were at the normal US market retail price today (50$ average), that would be 1,750$ out of your pocket, and that's just ONE person! Imagine the millions who like the series! That's about 1.7 billion for every 1 million people in the franchise. Not to mention, they sell T-shirts, bags, hoodies, memory cards, key chains, soft drinks (Yes, an actual SOFT DRINK by the name of "Potion", what else?), movies, strategy guides, and even posters...