...Some people use their extra money to gamble, club, drink, womanize and many more but it's wise for you not to use this funds for consumption purpose. ..
Investing with your discretionary income allows you to pile up more bitcoin for yourself overtime and hodli till your desired time.
But in any case, you should not limit yourself to entertainment, because living with the sole purpose of accumulating more bitcoins is pointless. You have provided a good list of what you can spend your discretionary income on, do not limit yourself, because life is short)
That's true but when the discretionary income is low and not be able to meet up with the bills of entertainment and bitcoin investment , you will have to choose which one is more important, because for me I would rather choose invedt first, then if their is anything left then entertainment can come second.
Life is very short no doubt and everything needs to be balanced but when it is impossible to afford everything at a time just go for what you really need, the rest can come up later.