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If you want to borrow and invest in crypto, you must have a very good knowledge of the market. Maybe you have a good knowledge of the market and can analyze how well a coin can do, or you've had a lot of luck because you borrowed money and invested in crypto and made a lot of profit. It is very rare to see someone who borrows and invests in crypto to pay off the loan and keep the profit. This is a very big risk so if one can afford to accept this risk then he must earn money by borrowing and investing otherwise it can have a bad effect on him.
Well, that's the reason why we always say to newbies that they need to learn first before investing because if they continue learning, they can maximize other people's money with their knowledge (borrowing and taking a loan).
I don't think that luck plays a big role when it comes to investing. Maybe if you're focused on lower market cap coins, but if you're focused only on Bitcoin or even Ethereum, knowledge is more important than luck. So, you're saying that what happened to me is considered "rare" scenario then because it happened to me, and I did manage to pay of my loan?
It's a big risk to borrow money just to invest don't get me wrong, but like you said, if you have knowledge with regards the market, if you know how the crypto market is moving, you will have an idea on what will happen a few years from now hence, building a strategy from it.