Instead of saying something like:
"What would be the purpose besides it was in FFXI"
You would know what the purpose of a Fame system would be if you had actually played the game. Other games post 2002 started incorporating fame systems as well because *gasp*..it's a good system and opens the doors for content based around your particular playing habit.
This is why a Rank system (GC) is nowhere near close to what a fame system, they're 2 separate entities.