It'd be nice to have some flashy consumable firework for MGP. Something on par with Ultima/ZTK/DiamondDust/etc and high priced MGP.

Anybody that regularly does GS stuff is going to have more MGP than it's possible to spend.

I don't think they intend to release another super high priced 2m+ MGP mount anytime soon, so something to repeatedly buy seems like the solution.

(And even for players that have the MGP, might not buy the mounts just because they already have better mounts)