That's just not true, take for example stocks, real estate, etc.
You're correct for real estate.But wait, stock is the same, some people loss and some people earn, because the larger people invest in stock, it will pump the stock price.
I think that you should accept the fact people use Bitcoin more as an investment than as a currency and centralization trying to adopt Bitcoin. You know, Bitcoin is decentralized, decentralized is where no one can control Bitcoin, so it's up to anyone to use Bitcoin for whatever they like and doesn't limit specific people or institution to buy Bitcoin.
I accept that fact, but that brings the contradiction with it. If bitcoin is an investment and not a currency, than this means the only reason it goes up is because people think that other people will buy it, and thus its price will go up, not because they want to use it as a currency.
There is no contradiction. Bitcoin can be both an investment and a currency. The fact that its value can fluctuate based on market demand doesn't negate its potential as a medium of exchange. ALL markets, including traditional ones, are driven by speculation and demand. Whether it's stocks, real estate, or art, the value of an asset often depends on what people believe it's worth. Simple math actually, if there are more buyers than sellers, the price goes up, and vice versa. But that still doesn't mean Bitcoin isn't a currency. It can, and in fact is, used as a currency at any price. You just move the decimal point a few notches to the right.
About stocks, it's different because when you buy a stock you buy a share of a company, you get some power in the control of it, its profits, not just from the price of the stock.
The primary driver of stock prices is still market speculation. People buy and sell stocks based on their expectations of future earnings, and other factors. But while this is true for stocks, you are aware that there are other assets in the market as well. Many of these assets don't offer direct ownership or control. Their value is primarily driven by market sentiment and speculation.
I was referring to the transaction / operation cost.
Currently, the transaction fee is around 2-3 sat/vB. That's roughly 30 cents for simple one-input, one-output transactions. You think that's too expensive to interact with the most secure decentralized network out there?