I'm not even sure what point you're trying to make here except "Ra! Ra! FFXIV!"
WoW's transmog system is better than FFXIV's glamour system in just about every measurable way. You shouldn't feel like this is some kind of attack here, it's just a fact.
120k gold was a lot at the time, not so much now. 40% of players having a mount like this IS a sizable portion of the playerbase. Also that was a really good guess if that was a guess.
https://www.worldofwargraphs.com/global-stats/mounts says 39.3% of players own that mount.
Beyond the mount though transmogs are easy to apply in any city, cost peanuts, are saved per character and per specialization (which means the same piece of gear will have a different transmog applied when you change specs), and oh yeah the appearance collection is still a thing.
It's ok for WoW to have a better system, but it should be a model for how FFXIV can do better in this regard.