as a rough rule

one-time investments is not where you should be saving the money.

those little things you spend on everyday is what empties your bank account all the time.

you're not gonna be rich by saving on daily expenses. i think you can spend on those.

the thing is that when you happen to have more, invest in something.

a trip to visit a good friend is also an investment. buying a new instrument to explore your musical abilities is also an investment. those last a long time, so they're an investment into your happiness. any wife who doesn't get this should shut up.