I know that discretionary income is the leftover money after you have paid for monthly expenses, and you are allowed to use your discretionary income the way it pleases you. I still believe using your discretionary income to live a lavish lifestyle will drive you to sell your bitcoin too early. For example, you can go to a club and mistakenly spend way more than your discretionary income, and if you don't have any other money elsewhere that you could use to complete the money in your hand and pay for the extra expenses you incur in a club in the process of living a lavish lifestyle with your discretionary income, it can drive you to sell your bitcoin too early to pay for your bill in a club so that you could go home and rest.
Discretionary income is not meant to be spent on things that are not meaningful; it is the money left over that needs to be spent wisely. As a reasonable investor, it doesn't make sense to go clubbing when you can't afford it, and there are other tasks that are valuable to meet. Generally, money is meant to be spent, but if you spend it on things that have no meaning and no value, then you will fall back to square one. With discretionary income, you need to comport yourself very well and know how much you need to invest in Bitcoin and what will be left with you.
As an investor, it is very important to have knowledge of money management, to know what you want, how much should be spent, and the amount of money that needs to go for investment. If you pursue a lifestyle that you cannot afford, you may end up being unable to make any investments.
The whole idea of discretionary money (income) is that you can do whatever you like with it. You can be responsible or irresponsible. It is the money that you have left after your expenses.
Sure some folks invest and others do not. Some folks buy high quality products and others buy low quality products.
We should not be trying to tell others how to spend their money, even though some ways of living are more meaningful, and some folks don't even believe in investing, and so they may well end up working all of their lives.. so there re likely consequences for the choices that any of su make.