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Why is the BTC stock market so interesting?

There can be many reasons. 
It could interest you in its complexity and the varying ways to look at things and the way one thing affects another. It may interest you how sentiments and feelings about things change their value minute by minute. You may just be impressed by the total values in billions of dollars and currencies changing ownership in minutes. It may interest you about the differences in opinions in reasons for a market exuberance. 
I see an expanding bubble waiting to deflate with overvaluations as too common not nearly in line with the actual businesses they represent ownership in. 

You should look into bitcoin and why and how that exists. 

If American (USA) very few people realize and understand that today, it is all one giant accounting book on computers. The Social Security system has tax money entered in as an accounting input and checks written as direct deposit numbers into accounts, but the assets of the system are government debt as the US government owing itself money, 

Money is now fiat as backed by faith like a religion. So we say precious metals are real, but their use is limited in value of its ability to actually sustain life. So we say land and property is real, but alas, the ownership is based on a different accounting system in government records and can be taken away by the stroke of a pen. 
Food is perishable. Water has been an eternity of recycling and redistribution. 
The stock market and commodities are just another system of trading wealth.