Higuain scored more than 100 goals on less than 200 matches for Real. He was Real's top goal-scorer once. When he arrived in Napoli they paid 40mln for him. He spent years there being one of the best goalscorers in Europe and being the best in Italy when it comes to strikers. He had like 70 goals on close to 100 matches. He was also scoring for Argentina, a goal every other match. His price was realistically high considering his performances. Very high. Then, we happened to sell Pogba. We wanted a striker and Napoli managed to milk every penny out of us, eventhough his price was surely around 70mln. There was a football history behind Higuain where he played for one of the best teams in the world while being their best goalscorer. He was the best goalscorer, or always top 2, in Italy for many years. He had a big CV covered with shitload of goals. Belotti has one season in Torino. Not to mention how it's Torino and they can't hold out for a huge price simply because they are a shit club.
China teams overpay but they are not an indicator of prices. Also, Belotti wouldn't go to China.