Dunno if y'all have seen the announcement about it (click here) but apparently this is a thing now.
Looks like Gaia is trying to crib Starbuck's schtick, eh??

It used to be that spending tiers were spending GCash,
but people found a loophole of buying the GCash giftcards and abused the system that way.
Then they got the bright idea of earning stuff from "spending" tiers NOT by buying stuff with GCash,
but instead the actual purchase of GCash in whatever amount earns you the items.
I guess with this star system they kinda brought back the incentive to, y'know... BUY s**t??

Oh yeah, and I'm pretty sure these free grants have something to do with it lolol
Human and Paws~<3