The reason why ghost head swordfish is relatively cheap is mainly due to the quality of its meat and the fact that it has more spines. Compared with grass carp, the meat quality of ghost head swordfish may not be as tasty as grass carp, and ghost head swordfish has more spines, which may make some consumers hesitant to buy it. In addition, Yingkou, as a major swordfish producer, has relatively cheaper local swordfish, which may also contribute to the relatively lower price of ghost head swordfish.

It should be noted that these reasons do not apply in all cases and prices may vary depending on factors such as region, species and quality. Overall, the relatively low price of Ghost Head Swordfish is mainly due to the quality of its meat and its more spiny condition, and this may also be the reason for its relatively stable price.