>>17548239NTA, but this is pretty short-sighted. It's true that your oshi will get less money *directly* from your concert ticket than your SC. However, it's not as simple as just an one-time direct income (and a tiny bit, too).
Buying a ticket will allow you to contribute to making the group - Hololive in this case - bigger. The bigger the group become, the better treatment they - and thus, your oshi - will get. They might get better sponsorships. They will be able to attract more fans (thus, more SCs). They will have more funding to allocate 3D tech, models, merch, and various other projects / stuffs. "Hey, this is the group that hosted concerts for hundred thousands people" is a lot more attractive for sponsors and normies than "Hey, this group's concert only gathered few thousands, but their fans donated shit tons of money to their members"
All in all, supporting the group IS supporting your oshi, and arguably better in the long term than giving your oshi a single SC unless you think your oshi is quitting soon - this is especially true seeing Cover has never dumped any of their talent, no matter how unpopular they are (even RBC and Choco get sponsorship nowadays). There is a reason why big idols (i.e: AKB or Momusu previously) would prefer you to attend their concerts (even though they get shit from the shares) than finding out ways to give them gift / money directly.