It's fine. Lots of people are making that mistake.
It's going to take people a while to realize that a VOCALOID is simply a voicebank/voice library that uses Yamaha's VOCALOID synthesizer engine and nothing else.
FYI The Piapro Studio Wiki will become the new hub for Miku, Rin/Len, Luka, MEIKO, and KAITO once the new software is released.