Uh, wasn't expecting to get this many replies. But anyway...
Based on the earliest post time (and/or edit time if applicable), will be sending instructions to:
QUOTE(杨岳欣 @ Mar 28 2024, 08:00)

I want a gold star@93.8M,thx
QUOTE(peter723pan @ Mar 28 2024, 08:00)

Bronze to Gold
QUOTE(unitready @ Mar 28 2024, 08:00)

one gold star please
QUOTE(-Daiki- @ Mar 28 2024, 08:00)

I want to upgrade to Gold star
QUOTE(Shizuka Natsuki @ Mar 28 2024, 08:00)

WTB 1 Gold Star @ 100M
...shortly.
The thread is now closed. Thanks to everyone for your interest!
FWIW, I might limit that each user can only buy 1 (or 2?) star/upgrade per round/event, seeing how popular this shop is getting.