Why do people buy so many?
Disposable income and lonliness.
Also partly a collector thing. If you got one, you want another. And another.
Like me, I first just wanted Alice. And then Marisa to keep her company. Then I kinda wanted Sakuya. And then I started craving to have the rest of the Scarlet Devil Mansion. I mean, I just got to get Patchouli to complete the three magician's set right? Alice could use more friends.
So now I have Remilia on pre-order. I'll get Flan and Patchy one of these days too. Then I might as well get Meiling right so Sakuya has someone to pair up with plus it would complete the SDM set, I mean, I don't think there's a Koa fumo, but if there is I'd need to get that too...
See what I mean?