This round of bull market is different from the crazy bull market in my impression:

1. Bitcoin skyrocketed n times in three or four months, various copycat coins were flying all over the sky, and ten-fold coins emerged one after another.

2. Major media reported how much Bitcoin skyrocketed, and a certain coin skyrocketed hundreds or thousands of times. After seeing the reports, the public entered the market one after another, dreaming of getting rich overnight. There were always people in WeChat Moments and Weibo showing how many times their income had increased every day.

3. Mining machines are hard to find in the market. The payback period of high-performance mining machines is within 200-300 days, the payback period of medium-performance mining machines is 100-150 days, and the payback period of old mining machines that have been eliminated is even only 20 days. The selling price of second-hand mining machines that have been used for less than 1 year is at least double the original price of new machines.