Investment in cryptocurrency is not certain and I don't think it is something you should invest the amount you can't afford to lose.
Right, invest only the money afford to lose cause you never regret how much you lose in your investment. Investing in bitcoin is good but so risky cause you don't know when it comes to decrease or increase, it is good to invest only the amount afford to lose.
You're both right because that the advice the best cryptoneirs will give to every crypto investors but I can assure you that ones can still invest more than she can afford once you know the depth of the rules, regulations, time to enter and exit crypto currency market.