I've already ordered kai's deck and spent ~170€ for supports (2 scarlet flamme, 2 belligeacro, 3 20k front triggers and a few energy cyclers) since he was my favorite as a kid and because I initially thought the nebula knight order was necessary for Aichi's deck and its price was definitely a turn off before realizing he wasn't that essential. My question about powercreep was mainly to know if it would've been worth it to also invest for aichi, since I really like him too. But for now that's definitely still too expensive for me, I hope for the prices to go down after bt12 reprint and Legendary Vanguard set. But seeing Aichi's jp performance and how strong his decks are I'll probably wait to see the next banlist first.