Yes, the market keep it that way, imagine if everyone gains and no one will lost the capital goes down and btc value will be back where it started. There's a gamble when it comes to investment.

The market is a profit and loss platform. One losses and another gains. It all matters what you know, the move you make and the ability to push your way. So one investor gains and another looses.

No, not always so. Of course, it often turns out like this, but everyone has the right to decide when to buy and when to sell. If you look at the example, then it is not obliged to sell when the price reached $ 6000 in January 2018

Ok, let us take it away from Bitcoin and into forex trading for instance. How would you explain what happens each time someone closes a trade in profit? Don't you realize that someone else loses? Of course, that's how it works. I once bought regalcoin at $62 not knowing it was at the overbought. Now regalcoin is shitcoin at $0.30+ or so. At the time I bought, someone sold and took profit, right? You see, that someone made profit but I lost out. That's the way it works.

No, it's not true. Read on the Internet what is capitalization and how the market works. This naive theory can be turned against those who earn on stock exchanges too. Since if you earned from $ 100 a few thousand, at this time another person, can earn hundreds of times more.

every time you are making a profit, well, it's some other peoples money - that's the way you make a profit.

 Actually it is not correct in a word. But it correct in another sense when the company progressless then profit for means loss for another person.

Both buyer and seller can make profit and there is a probability that both lose money. But for sure there are many people in cryptocurrecncies making money and also many people losing money. But I don't think the ratio is 1:1. I think the number of losers are much more than the number of winners. Because most of humans cannot be patient. The patient person gets several impatient person's money.

This is no different than the way that the stock market operates. People buy and sell all the time, some at a profit, some at a loss. So while you are technically profiting from someone's loss, let's not forget that new bitcoins are being mined on a regular basis. While the cap maximum supply is limited, that hasn't been reached yet, so the circulating supply is growing on a daily basis.

I think this is what people want to believe as a "scam" when they hear about Bitcoin. That in order for you to profit, you have to sell for more than what you bought for. Here's the thing, and why I'm able to sleep at night playing the crypto market: I don't prey on new buyers. I don't make them pull the trigger in deciding when or what to buy. Just as in the stock market, buyers should do their due diligence and invest only what they believe is a good investment for them. Nobody is forcing these buyers to make their investments. So just as I think that it's a great thing that I bought in at $200, some new investors might think it's great that they are buying in now at $8k.

There are always winners and losers in every situation.  I guess it depends on your goal.  During the crash I was buying up ETN at levels I had predetermined for myself, down to 600 sats, few days later it was backup to 840~ sats, however my goal is to hold as much as possible, so those sellers may consider themselves 'winners' with their profit now, but hopefully in a few months, i'll be the winner.