FF does not have a lot in game that keeps it's rarity very well. Getting the mount early gives the, 'oooeh shiny' feeling. At least for a while till they let you buy it and everyone and their mother gets it and for many players it's no longer as special.

Plenty people value that bit of exclusivity. Similar to having full BiS in early savage tier or the ultimate weapons soon after the release. Sure later on in time more people will have all those things, they get easier to get. But it's nice to have that time to show off your shiny thing for a bit.

I don't mind getting the mount later. I appreciate the happy medium with the system as is.