Why modern trading system sucks?

Have you ever heard what trading is all about?

It's all about exchanging goods for goods. For example, there is a person who makes clothes and a second person who runs a bakery, right?
Both the men are in need of each other for, sure? Yes!
Now modern trading is all about money in exchange of money. You sell your gold to earn money. But does that money have a real value? No.

There are two types of money, one which have a real value and other merely a number.
Modern cryptocurrencies as well as paper money are what I call a money with merely a number. But who wins at the end?

One who owns merely a number or tons of Gold. Obviously one who have gold. But what makes modern trading system suck too much? That's a point where a owner of Gold can flood the market to make your currency which is merely a number go hell lot of down.

The trading is just like a Roulette at any casino, who is going to win at last? Casino or you!