More casual players will eat up anima more, here's my reasoning:
In a condensed amount a time a casual player will try to do as much as he/she can
quickest way around is anima. Chocobo and ships take time.
A player who has more time will always balance the anima/chocobo time/airship time because they'll have that choice, where as a casual player will always take anima due to the limited time.
That's where casual would like to spend their gil for instant teleport, the gil for no time transport is advantageous to their limited time.
My 2 cents.