It's not about what I understand, it's about what I get. After buying bitcoin I get the ability to watch number on the screen. If I sell bitcoin to someone else, they also get the same ability. No human being can get anything after purchasing bitcoin,  except this ability. So it's not like in the case of securities where people get the ability to recive the capital at a security withdrawal from the market. It's not like in the case of gold where people get the ability to use gold for jewelry, electronics  and so on. It's literally the ability to watch a number on the screen.

And of course it's not that only today everything is numbers. It was always like that. Numbers always existed. It's not Satoshi that invented them. But numbers have always been just an axillary means to mathematically express the quantity of something. In the case of securities to express the quantity of capital that security issues borrowed and are liable to return. In the case of gold, the quantity of this metal. When I am buying 10,000 EUR I am not buying number "10,0000". Rather, I am buying the ability to recive a specific amoun of capital at the EUR withdraw, wich is at loans liquidation/repayment. When I am buying two ounces of gold I am not buying number "2", but the ability to utilize gold for jewelry and other purposes. On the other hand, when people are buying one bitcoin they are literally buying number "1". And the only ability they have is to watch that number like pictures are watched. I am simply asking why would I buy something like that from people? Why would I gave them an enormous amount of money only to get the ability to watch a number?