The 100% Utauloids are kinda a "extra" to the 100% Magazines that comes also with plugins and tips how to use utau right (maybe someone need to translate some of the magazines lol)
Well if you will do that really, then those voicebanks would be the first UTAU voicebanks that will be selled.
edit: nvm that, the series is a Vocal plugin, not a voicebank, lol
Thou, if you really want to sell them, you need voicers who do their best into japanese pronunication and have unique voices as well. Also, recording studios are quite expensive atm lol.
but if you do one, maybe make a vcv of popular singers? or people who sound like those?
thou it would be awesome if LilyPichu would voice a utauloid omg