Is the blue glazed porcelain of Kangxi period in Qing Dynasty valuable?

20 15 Auction of A Qing Kangxi Blue Glazed General Bottle, the porcelain is valued at 20,000 yuan; 20 14 auctioned a Qing Kangxi blue glazed plum bottle with an estimated price of 30,000 yuan, and later the transaction price was 42,000 yuan. It can be seen that the price of blue glazed porcelain in Kangxi period of Qing Dynasty was not too high, but porcelain in Qing Dynasty was always on the rise, including blue glazed porcelain. thank you