User blog comment:CaiyinMusic/Xin Hua's Popularity?/@comment-30602727-20150518134249/@comment-30602727-20150518143811

Doesn't help that she's not easy to buy either.

So now it's up to the producers. They need to make more songs... and it took this long to make a group/duet for her and the other past Chinese VOCALOIDs. Duets/group songs do help promote the VOCALOIDs involved. ;w;