Your prices seem a little high and the 90% figure for piracy seems low.
A standard audio cd retails in Shenyang for 5 yuan, in fuzhou for 6 yuan and Beijing for as much as 7 yuan. Thats about 35 to 50 pence, mostly at the bottom end of the scale.
They're not popular though as you can get any band/group/singers entire discography in high-bitrate mp3 format with a few concert videos thrown in on a double DVD set for 10 to 12 yuan.
As for the 90% pirated, maybe in city centre Shanghai with police instructed to crack down it might drop that low... until the police left and the cupboards were re-opened.
Even the foreign chains here (Walmart, Carrefour etc) exclusively stock cheaply copied disks with photocopied paper sleeves n a plastic envelope. They charge four times the going rate for them and have significantly lower quality encoding (and production) than the 5 yuan disks on the streets.