Oh, most certainly, I know that that's how their marketing tacting is. Hatsune Miku sold well, people want girls, moe, cutesy voices/designs, that kinda thing, explaining why there are so many of those kinds of Vocaloids. Sucks that there's barely any males, I'd prefer there to be more unique voicebanks/characters, which is why I like so few Vocaloids. They keep making lots and lots more, that to me, personally, have no effect other than, "Another one?" (this pertains to the moe Vocaloids)That's basically what the market wants (V3 was the worse) and UTAU is free to create a bank so it's quite obvious it'll have tons more banks; whereas Vocaloid where companies have to pay money to make one.
They tend to stick to trends so they'll get guaranteed sales. That's why Vocaloid have so much similar banks (heck, Japan doesn't even like male voices that much which causes companies to make them quite rarely)