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I really don't like that term, money you can afford to lose, I will prefer we use the term discretionary income, when we use the term money we can afford to lose when it comes to bitcoin investment it sounds like gambling, and using that term may create some mindset that Bitcoin is like gambling to a newbie who wants to go into Bitcoin investment.
For a long term Bitcoin investor his using his discretionary income and not money he can afford to lose.
Your not liking the expression (don't invest more than you can afford to lose) likely shows your lack of understanding what that expression means..and no, if you were to understand what it is actually communicating, it does not mean or sound like investing in bitcoin is like gambling or investing into shitcoins, even if you understand the expression to seem like that is how you are thinking about your bitcoin investment.. but hey whatever, you can interpret expressions however you like, even though you seem to be lacking in your own appreciation of the underlying idea or how discretionary income does not communicate the same message as "money you can afford to lose"...even if the ideas relate to one another they are saying slightly different and perhaps even overly subtle things that you are not quite seeming to grasp the idea...
From my own perspective, "money that you can afford to lose" seems to be a sub-category of discretionary income and other members have also described it in a similar way in regards to money that we lock up for 4-10 years or longer and we don't even necessarily expect to get it back (even though we are not wanting to throw the money away, at the same time, we understand that we are locking the money away for a long time, and we may or may not ever get it back for a variety of reasons, even our own death that would mean that we never spend the money that we could have had spent today, we defer gratification for later and we are not guaranteed to achieve such later deferred gratification), so money that you can afford to you seems to be very well describing an even more narrow category of money as compared to the more broad descriptive category of discretionary income. .that is merely any extra money that a person may have after accounting for all expenses (whether calculated and/or estimated on a monthly basis, weekly basis, daily basis or otherwise).
Bitcoin is an investment and nobody that is investing on Bitcoin is expecting to lose his or her money, some people are even using Bitcoin investment as there retirement investment plan so you can't classify money used for Bitcoin investment as money I can afford to lose, people use huge amount of money to accumulate Bitcoin using lump sum strategy and even if you are using DCA strategy and maybe you are using $50 to accumulate weekly if you sum it up for 10 to 20 years is a huge amount of money also, so are you saying this money are money you can avoid to lose I doubt.
Yes I understand the point you are trying to make However having a discretionary income and using it for Bitcoin investment those not mean you don't have other use for it, our Discretionary income can be used for other things or investment but we choose to invest it on Bitcoin not because we want to try luck but because we want to benefit from Bitcoin in years to come and that's why we buy and keep holding.
Money we can afford lose and Discretionary income is related but serve different purpose,
Money we can afford to lose: is Money you can risk, invest or spend without it damaging your financial stability or status.
And Discretionary income is the portion of your income
that is left over after settling essential expenses such as taxes, housing, food, mortgage, water, electricity bill, etc.
And if not used wisely can after your financial stability and status.
Now losing discretionary income could potentially affect your savings or financial goals because it is this Discretionary income we use to build our backup funds such as emergency, float and reserved funds, but losing money designated as money we can affordable to lose will not affect your financial savings or financial goals.
Money we can afford to lose is gotten from discretionary income and when you want to use your Discretionary income the smallest amount which is lift that can't be used for any other thing be it investment or luxury life style etc are the money you can afford to lose.