Doing a quick tally, so might've missed some, but I've bought at least 12 LPs, 7 EPs, 40 singles plus 2 tracks off albums I deemed not worth buying fully. Additionally I've bought 2 EPs and 4 singles of Midnight Grand Orchestra which is technically an ordinary J-Pop act that just happens to have a vtuber as a singer, and 2 singles from Kanaria who wasn't a vtuber yet at the time (but I bought them because of Suisei). Piggybacking off that, the reason I bought the entire catalogues of a couple of "normal" Japanese bands is because of how much I enjoyed vtuber covers of their songs. I've also bought something like 14 concert tickets plus 2 more for Midnight Grand Orchestra again as well as 2 Blu-Rays.