Let's be honest: how many people apply this rule?
Note: this is not to encourage anyone
since I know bitcoin, I've always been selling my stuff in the real world to buy bitcoin, I've sold my cell, I've sold my video card, I've sold my entire computer, I've sold a lot (I really miss) to buy bitcoin and I don't regret these choices
well, it takes a lot of courage. most people nowadays are really looking for money in their life. the point is that not everyone wants to take big risks. maybe quite a lot of people who don't care about these rules and have become rich, but vice versa. Well, that's because they can take a big risk.
personally, I follow this rule. however, I still still love crypto, it's just that everyone has their own way of growing and investing in the business world, especially crypto. but it might be good for you.