Stop exaggerating on that. NOT 98% OF THEM. Yes, Miku has more songs than the others, she's the most popular, so, the most used.The other VOCALOIDs do get attention and are being used. But, a question, why the hell did you post such a question on this picture ? Only because Miku is in the middle ? And I mean that there is a lot, a lot of songs of other VOCALOIDs without Miku in them. I'm pretty sure they exist. Sorry if I sounded rude, but I can't help it.
Helpless ? You mean like in "Daughter of Green" ? Not always. Sometimes. For sad songs. Stupid question ? I don't care if it's stupid or not, it's not the place to ask a question like that. I don't want to waste my time (and yours too) on this, I'm sorry if I sounded rude, so let's stop here. Have a good day.
Asking a bit too much at this point. People will use the most popular, people will create more with the popular one and before most of the newest Vocaloids came out, (I think) Miku was the easiest to use.